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The Words of the Sledge
steve@einval.com

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Interesting times, and a new job!

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It's been over ten years since I started in Arm, and nine since I joined Linaro as an assignee. It was wonderful working with some excellent people in both companies, but around the end of last year I started to think that it might be time to look for something new and different. As is the usual way in Cambridge, I ended up mentioning this to friends and things happened!

After discussions with a few companies, I decided to accept an interesting-looking offer from a Norwegian company called 灯蓝专业版免费 安卓. My good friend Vince had been raving for a while about how much he enjoyed his job there, which was a very good sign! He works from his home near Cambridge, and they were very happy to take me on in a similar way. There will be occasional trips to the UK office near Reading, or to the Norway HQ in Oslo. But most of the time I'll be working in my home office with all the home comforts and occasionally even an office dog!

As is common in the UK for senior staff, I had to give 3 months notice with my resignation. When I told my boss in Arm way way back in February that I had decided to leave, I planned for a couple of weeks of down-time in between jobs. Perfect timing! The third week of May in Cambridge is the summer Beer Festival, and my birthday is the week after. All was looking good!

Then the world broke... :-(

As the "novel coronavirus" swept the world, countries closed down and normal life all-but disappeared for many. I acknowledge I'm very lucky here - I'm employed as a software engineer. I can effectively work from home, and indeed I was already in the habit of doing that anyway. Many people are not so fortunate. :-/ In this period, I've heard of some people in the middle of job moves where their new company have struggled and the new job has gone away. Thankfully, Pexip have continued to grow during this time and were still very keen to have me. I finally started this week!

So, what does Pexip do? The company develops and supplies a video conferencing platform, mainly targeting large enterprise customers. We have some really awesome technology, garnering great reviews from customers all over the world. See the website for more information!

Where do I fit in? Pexip is a relatively small company with a very flat setup in engineering, so that's a difficult question to answer! I'll be starting working in the team developing and maintaining PexOS, the small Linux-based platform on which other things depend. (No prizes for guessing which distro it's based on!) But there's lots of scope to get involved in all kinds of other areas as needs and interests arise. I can't wait to get stuck in!

Although I'm no longer going to be working on Debian arm port issues on work time, I'm still planning to help where I can. Let's see how that works...

18:22 :: # :: /misc :: 1 comment

What can you preseed when installing Debian?

Preseeding is a very useful way of installing and pre-configuring a Debian system in one go. You simply supply lots of the settings that your new system will need up front, in a preseed file. The installer will use those settings instead of asking questions, and it will also pass on any extra settings via the debconf database so that any further package setup will use them.

There is documentation about how to do this in the Debian wiki at 灯蓝官网下载_灯蓝加速器永久免费版_灯蓝专业版免费安卓:2021-1-6 · 蓝灯下载_蓝灯手机版下载_蓝灯安卓版免费下载-太平洋下载中心 更快、更亮、功能更强大更好用的手电筒。支持Flyme所有版本。更小安装包，不占内存，启动迅雷不及掩耳，居家旅行出门在外必备神器。本站提供蓝灯下载。, and an example preseed file for our current stable release (Debian 10, "buster") in the release notes.

One complaint I've heard is that it can be difficult to work out exactly the right data to use in a preseed file, as the format is not the easiest to work with by hand. It's also difficult to find exactly what settings can be changed in a preseed.

So, I've written a script to parse all the debconf templates in each release in the Debian archive and dump all the possible settings in each. I've put the results up online at my debian-preseed site in case it's useful. The data will be updated daily as needed to make sure it's current.

Updated June 2024 - changed the URL for the preseed site now I have a domain set up at http://preseed.debian.net/.

17:53 :: # :: /debian/misc :: 2 comments

Presenting guest lectures at the University of Lincoln, January 2024

Dr Charles Fox from the University of Lincoln contacted me out of the blue back in September. He asked me if I would give a couple of guest lectures to his Computer Science students. I was deeply flattered! I took him up on his invitation, and on Tuesday 28th Jan I headed up to visit him and the TSE students.

My first talk was to provide background on Free and Open Source Software. I started with the history of software in the 1950s, working forwards through the events that sparked the FLOSS movement. I spoke about the philosophical similarities and differences between Free Software and Open Source, and how FLOSS has grown to a state of near-ubiquity. Several of the students are already involved in some existing FLOSS projects, so I was clearly preaching to the choir! I hope I managed to interest the rest of the audience too; I certainly had a warm welcome! Slides are here, for reference.

Next up was my specialist subject: Debian! I gave a brief introduction to Debian, covering what we do, how we do it, and why we do it. I covered important things like our Social Contract and the DFSG, and how Debian's thousands of contributors work together to package many thousands of disparate software projects into the large, stable Debian operating system that we all know and love. I was even brave enough to give a brief demo, showing a simple package update for a bug I'd prepared earlier! Slides are 灯蓝专业版免费 安卓, for reference.

In both talks, I was keen to point out the many good reasons for contributors to get into the FLOSS world, using my own personal experience as a guide. I've been working in this world for many years, and it's been a very important part of my life and career.

After lunch and some fun conversation with Charles and some of his students, I was given the grand tour of the department. Charles is working with a large group of people doing research in agricultural robotics and autonomous vehicles. I got to see lots of interesting projects and meet lots of cool people from amongst his students and colleagues. They're doing some amazing work on things that might soon be key in making agriculture more efficient: autonomous systems to identify and automatically remove weeds from wheat fields, to robotic systems designed to help with growing, monitoring and harvesting soft fruit like strawberries. Totally outside my field, but it was fascinating stuff!

I had a fun day in Lincoln, talking to lots of people and hopefully spreading enthusiasm for FLOSS and Debian in particular. Charles and I chatted about how his students might get involved in our world. You might get to meet some of them at upcoming Debian events!

02:00 :: # :: 安卓灯蓝专业版下载 :: 0 comments

If you can't stand the heat, get out of the kitchen...

Wow, we had a hot weekend in Cambridge. About 40 people turned up to our place in Cambridge for this year's OMGWTFBBQ. Last year we were huddling under the gazebos for shelter from torrential rain; this year we again had all the gazebos up, but this time to hide from the sun instead. We saw temperatures well into the 30s, which is silly for Cambridge at the end of August.

I think it's fair to say that everybody enjoyed themselves despite the ludicrous heat levels. We had folks from all over the UK, and Lars and Soile travelled all the way from Helsinki in Finland to help him celebrate his birthday!

We had a selection of beers again from the nice folks at Milton Brewery:

Lars made pancakes, Paul made bread, and people brought lots of nice food and drink with them too.

Many thanks to a number of awesome friendly companies for again sponsoring the important refreshments for the weekend. It's hungry/thirsty work celebrating like this!

• Mythic Beasts covered some of the beer costs
• Collabora paid for food and drink
• Codethink paid for food and drink

21:17 :: # :: /debian/uk :: 0 comments

DebConf in Brazil again!

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I had a very busy time, as usual - lots of sessions to take part in, and lots of conversations with people from all over. As part of the Community Team (ex-AH Team), I had a lot of things to catch up on too, and a sprint report to send. Despite all that, I even managed to do some technical things too!

I ran sessions about UEFI Secure Boot, the Arm ports and the Community Team. I was meant to be running a session for the web team too, but the dreaded DebConf 'flu took me out for a day. It's traditional - bring hundreds of people together from all over the world, mix them up with too much alcohol and not enough sleep and many people get ill... :-( Once I'm back from vacation, I'll be doing my usual task of sending session summaries to the Debian mailing lists to describe what happened in my sessions.

Maddog showed a group of us round the micro-brewery at Hop'n'Roll which was extra fun. I'm sure I wasn't the only experienced guy there, but it's always nice to listen to geeky people talking about their passion.

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19:33 :: # :: /debian/dc19 :: 0 comments

Debian BSP in Cambridge, 08 - 10 March 2024

Lots of snacks, lots of discusssion, lots of bugs fixed! YA BSP at my place.

03:08 :: # :: /debian/bsp :: 0 comments

Rebuilding the entire Debian archive twice on arm64 hardware for fun and profit

I've posted this analysis to Debian mailing lists already, but I'm thinking it's also useful as a blog post too. I've also fixed a few typos and added a few more details that people have suggested.

This has taken a while in coming, for which I apologise. There's a lot of work involved in rebuilding the whole Debian archive, and many days spent analysing the results. You learn quite a lot, too! :-)

I promised way back before DebConf 18 last August that I'd publish the results of the rebuilds that I'd just started. Here they are, after a few false starts. I've been rebuilding the archive specifically to check if we would have any problems building our 32-bit Arm ports (armel and armhf) using 64-bit arm64 hardware. I might have found other issues too, but that was my goal.

The logs for all my builds are online at

http://www.einval.com/debian/arm/rebuild-logs/

for reference. See in particular

• http://www.einval.com/debian/arm/rebuild-logs/armel/FAIL/FAIL.html
• http://www.einval.com/debian/arm/rebuild-logs/armhf/FAIL/FAIL.html

for automated analysis of the build logs that I've used as the basis for the stats below.

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As far as I can see we're basically fine to use arm64 hosts for building armel and armhf, so long as those hosts include hardware support for the 32-bit A32 instruction set. As I've mentioned before, that's not a given on all arm64 machines, but there are sufficient machine types available that I think we should be fine. There are a couple of things we need to do in terms of setup - see 下载灯蓝专业版免费 below.

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I (naively) just attempted to rebuild all the source packages in unstable main, at first using pbuilder to control the build process and then later using sbuild instead. I didn't think to check on the stated architectures listed for the source packages, which was a mistake - I would do it differently if redoing this test. That will have contributed quite a large number of failures in the stats below, but I believe I have accounted for them in my analysis.

• Macchiatobin
• 灯蓝免费安卓
• Synquacer
• Multiple Mustangs

using my local mirror for improved performance when fetching build-deps etc. I started off with a fixed list of packages that were in unstable when I started each rebuild, for the sake of simplicity. That's one reason why I have two different numbers of source packages attempted for each arch below. If packages failed due to no longer being available, I simply re-queued using the latest version in unstable at that point.

I then developed a script to scan the logs of failed builds to pick up on patterns that matched with obvious causes. Once that was done, I worked through all the failures to (a) verify those patterns, and (b) identify any other failures. I've classified many of the failures to make sense of the results. I've also scanned the Debian BTS for existing bugs matching my failed builds (and linked to them), or filed new bugs where I could not find matches.

I did not investigate fully every build failure. For example, where a package has never been built before on armel or armhf and failed here I simply noted that fact. Many of those are probably real bugs, but beyond the scope of my testing.

For reference, all my scripts and config are in git at

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Almost half of the failed builds were simply due to the lack of a single desired build dependency (安卓灯蓝专业版下载, 1289). There were a smattering of other notable causes:

• 100 log(s) showing build failures (java/javadoc)
  Java build failures seem particularly opaque (to me!), and in many cases I couldn't ascertain if it was a real build problem or just maven being flaky. :-(
• 15 log(s) showing Go 32-bit integer overflow
  Quite a number of go packages are blindly assuming sizes for 64-bit hosts. That's probably fair, but seems unfortunate.
• 8 log(s) showing Sbuild build timeout
  I was using quite a generous timeout (12h) with sbuild, but still a very small number of packages failed. I'd earlier abandoned pbuilder for sbuild as I could not get it to behave sensibly with timeouts.

• 13 log(s) showing Alignment problem
• 5 log(s) showing Segmentation fault
• 1 log showing Illegal instruction

• 3 bugs for arch misdetection
• 8 bugs for alignment problems
• 4 bugs for arch-specific test failures
• 3 bugs for arch-specific misc failures

Considering the number of package builds here, I think these numbers are basically "lost in the noise". I have found so few issues that we should just go ahead. The vast majority of the failures I found were either already known in the BTS (260), unrelated to what I was looking for, or both.

See 安卓灯蓝专业版加速器 for more details about build host configuration for armel builds.

速帆加速器免费试用-outline

FTAOD: I attempted fewer package builds for armhf as we simply had a smaller number of packages when I started that rebuild. A few weeks later, it seems we had a few hundred more source packages for the armel rebuild.

The armhf rebuild showed broadly the same percentage of failures, if you take into account the nodejs difference - it exists in the armhf archive, so many hundreds more packages could build using it.

In a similar vein for notable failures:

• 89 log(s) showing build failures (java/javadoc)
  Similar problems, I guess...
• 15 log(s) showing Go 32-bit integer overflow
  That's the same as for armel, I'm assuming (without checking!) that they're the same packages.
• 4 log(s) showing Sbuild build timeout
  Only 4 timeouts compared to the 8 for armel. Maybe a sign that armhf will be slightly quicker in build time, so less likely to hit a timeout? Total guesswork on small-number stats! :-)

Arch-specific failures found for armhf:

• 11 log(s) showing Alignment problem
• 4 log(s) showing Segmentation fault
• 1 log(s) showing Illegal instruction

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• 1 bugs for arch misdetection
• 8 bugs for alignment problems
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• 3 bugs for arch-specific misc failures

Again, these small numbers tell me that we're fine. I liked to 139 existing bugs in the BTS here.

速帆加速器免费试用-outline

To be able to support 32-bit builds on arm64 hardware, there are a few specific hardware support issues to consider.

速帆加速器免费试用-outline

Our 32-bit Arm kernels are configured to fix up userspace alignment faults, which hides lazy programming at the cost of a (sometimes massive) slowdown in performance when this fixup is triggered. The arm64 kernel cannot be configured to do this - if a userspace program triggers an alignment exception, it will simply be handed a SIGBUS by the kernel. This was one of the main things I was looking for in my rebuild, common to both armel and armhf. In the end, I only found a very small number of problems.

Given that, I think we should immediately turn off the alignment fixups on our existing 32-bit Arm buildd machines. Let's flush out any more problems early, and I don't expect to see many.

To give credit here: 安卓灯蓝专业版加速器 have been using arm64 machines for building 32-bit Arm packages for a while now, and have already been filing bugs with patches which will have helped reduce this problem. Thanks!

Deprecated / retired instructions

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• SWP (low-level locking primitive, deprecated since ARMv6 AFAIK)
• CP15 barriers (low-level barrier primitives, deprecated since ARMv7)

Again, there is quite a performance cost to enabling emulation support for these instructions but it is at least possible!

In my initial testing for rebuilding armhf only, I did not enable either of these emulations. I was then finding lots of "Illegal Instruction" crashes due to CP15 barrier usage in armhf Haskell and Mono programs. This suggests that maybe(?) the baseline architecture in these toolchains is incorrectly set to target ARMv6 rather than ARMv7. That should be fixed and all those packages rebuilt at some point.

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• 灯蓝免费安卓 pointed out that ghc in Debian armhf is definitely configured for ARMv7, so maybe there is a deeper problem.
• Edmund Grimley Evans suggests that the Haskell problem is coming from how it drives LLVM, linking to 安卓灯蓝专业版加速器 that he filed in 2017.

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There are a few things I found that I'd like to highlight:

• In the glibc build, we found an arm64 kernel bug (#904385) which has since been fixed upstream thanks to Will Deacon at Arm. I've backported the fix for the 4.9-stable kernel branch, so the fix will be in our Stretch kernels soon.
• There's something really weird happening with Vim (#917859). It FTBFS for me with an odd test failure for both armel-on-arm64 and armhf-on-arm64 安卓灯蓝专业版加速器, but in a porter box chroot or directly on my hardware using debuild it works just fine. Confusing!
• I've filed quite a number of bugs over the last few weeks. Many are generic new FTBFS reports for old packages that haven't been rebuilt in a while, and some of them look un-maintained. However, quite a few of my bugs are arch-specific ones in better-maintained packages and several have already had responses from maintainers or have already been fixed. Yay!
• Yesterday, I filed a slew of identical-looking reports for packages using MPI and all failing tests. It seems that we have a real problem hitting openmpi-based packages across the archive at the moment (#918157 in libpmix2). I'm going to verify that on my systems shortly.

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So far in Debian, we've tended to run our build machines using chroots on raw hardware. We have a few builders (x86, arm64) configured as VMs on larger hosts, but as far as I can see that's the exception so far. I know that OpenSUSE and Fedora are both building using VMs, and for our Arm ports now we have more powerful arm64 hosts available it's probably the way we should go here.

In testing using "linux32" chroots on native hardware, I was explicitly looking to find problems in native architecture support. In the case of alignment problems, they could be readily "fixed up / hidden" (delete as appropriate!) by building using 32-bit guest kernels with fixups enabled. If I'd found lots of those, that would be a safer way to proceed than instantly filing lots of release-critical FTBFS bugs. However, given the small number of problems found I'm not convinced it's worth worrying about.

Utilisation of hardware

Another related issue is in how we choose to slice up build machines. Many packages will build very well in parallel, and that's great if you have something like the Synquacer with many small/slow cores. However, not all our packages work so well and I found that many are still resolutely chugging through long build/test processes in single threads. I experimented a little with my config during the rebuilds and what seemed to work best for throughput was kicking off one build per 4 cores on the machines I was using. That seems to match up with what the Fedora folks are doing (thanks to hrw for the link!).

Migrating build hardware

As I mentioned earlier, to build armel and armhf sanely on arm64 hardware, we need to be using arm64 machines that include native support for the 32-bit A32 instruction set. While we have lots of those around at the moment, some newer/bigger arm64 server platforms that I've seen announced do not include it. (See an older mail from me for more details. We'll need to be careful about this going forwards and keep using (at least) some machines with A32. Maybe we'll migrate arm64-only builds onto newer/bigger A64-only machines and keep the older machines for armel/armhf if that becomes a problem?

At least for the foreseeable future, I'm not worried about losing A32 support. Arm keeps on designing and licensing ARMv8 cores that include it...

速帆加速器免费试用-outline

I've spent a lot of time looking at existing FTBFS bugs over the last weeks, to compare results against what I've been seeing in my build logs. Much kudos to people who have been finding and filing those bugs ahead of me, in particular Adrian Bunk and Matthias Klose who have filed many such bugs. Also thanks to Helmut Grohne for his script to pull down a summary of FTBFS bugs from UDD - that saved many hours of effort!

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13:57 :: # :: /debian/arm :: 1 comment

And lo, we sacrificed to the gods of BBQ once more

As is becoming something of a tradition by now, Jo and I hosted another OMGWTFBBQ at our place last weekend. People came from far and wide to enjoy themselves. Considering the summer heatwave we've had this year, we were a little unlucky with the weather. But with the power of gazebo technology we kept (mostly!) dry... :-)

I was too busy cooking and drinking etc. to take any photos myself, so here are some I sto^Wborrowed from my friends!

We continued to celebrate Debian getting old:

Photo from Jonathan McDowell

We had much beer from the nice folks at Milton Brewery:

Photo from Rob Kendrick

Much meat was prepared and cooked:

Photo from Stefano Rivera

And we had a lot of bread too!

Photo from Rob Kendrick

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• Mythic Beasts
• Collabora
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03:24 :: # :: /debian/uk :: 0 comments

25 years...

We had a small gathering in the Haymakers pub tonight to celebrate 25 years since Ian Murdock started the Debian project.

We had 3 DPLs, a few other DDs and a few more users and community members! Good to natter with people and share some history. :-) The Raspberry Pi people even chipped in for some drinks. Cheers! The celebrations will continue at the big BBQ at my place next weekend.

22:42 :: # :: /debian/birthday :: 0 comments

DebConf in Taiwan!

So I'm slowly recovering from my yearly dose of full-on Debian! :-) DebConf is always fun, and this year in Hsinchu was no different. After so many years in the project, and so many DebConfs (13, I think!) it has become unmissable for me. It's more like a family gathering than a work meeting. In amongst the great talks and the fun hacking sessions, I love catching up with people. Whether it's Bdale telling me about his fun on-track exploits or Stuart sharing stories of life in an Australian university, it's awesome to meet up with good friends every year, old and new.

For once, I even managed to find time to work on items from my own TODO list during DebCamp and DebConf. Of course, I also got totally distracted helping people hacking on other things too! In no particular order, stuff I did included:

• Working with Holger and Wolfgang to get debian-edu netinst/USB images building using normal debian-cd infrastructure;
• 灯蓝专业版激活码购买 - 好看123:2021-6-14 · 伕理了 我伔需要把蓝灯...更多关于灯蓝专业版激活码购买的问题>> 8.灯蓝吧贴吧 点击前往 网站介绍：2021年7月15日 - 蓝色灯专业版破解版 "蓝.灯" 安卓 灯蓝加速器 灯蓝VPN 灯蓝破解版 蓝色的灯 安卓 灯蓝APP 灯蓝是什么软件 位置灯 客厅灯 led灯 魅蓝note6 魅
• Reviewing secure boot patches for Debian's GRUB packages;
• As an AM, helping two DD candidates working their way through NM;
• Monitoring and tweaking an archive rebuild I'm doing, testing building all of our packages for armhf using arm64 machines;
• Releasing new upstream and Debian versions of abcde, the CD ripping and encoding package;
• Helping to debug UEFI boot problems with Helen and Enrico;
• Hacking on MoinMoin, the wiki engine we use for wiki.debian.org;
• Engaging in lots of discussions about varying things: Arm ports, UEFI Secure Boot, Cloud images and more

I was involved in a lot of sessions this year, as normal. Lots of useful discussion about Ignoring Negativity in Debian, and of course lots of updates from various of the teams I'm working in: Arm porters, web team, Secure Boot. And even an impromptu debian-cd workshop.

I loved my time at the first DebConf in Asia (yay!), and I was yet again amazed at how well the DebConf volunteers made this big event work. I loved the genius idea of having a bar in the noisy hacklab, meaning that lubricated hacking continued into the evenings too. And (of course!) just about all of the conference was captured on video by our intrepid video team. That gives me a chance to catch up on the sessions I couldn't make it to, which is priceless.

So, despite all the stuff I got done in the 2 weeks my TODO list has still grown. But I'm continuing to work on stuff, energised again. See you in Curitiba next year!

16:11 :: # :: /debian/dc18 :: 灯蓝专业

Let's BBQ again, like we did last summer!

It's that time again! Another year, another OMGWTFBBQ! We're expecting 50 or so Debian folks at our place in Cambridge this weekend, ready to natter, geek, socialise and generally have a good time. Let's hope the weather stays nice, but if not we have gazebo technology... :-)

Many thanks to a number of awesome companies and people near and far who are sponsoring the important refreshments for the weekend:

• Mythic Beasts
• Collabora
• Codethink
• QvarnLabs
• Chris Boot

I've even been working on the garden this week to improve it ready for the event. If you'd like to come and haven't already told us, please add yourself to the wiki page!

03:00 :: # :: /debian/uk :: 1 comment

-1, Trolling

Here's a nice comment I received by email this morning. I guess somebody was upset by my 灯蓝专业版免费 安卓?

From: Tec Services <tecservices911@gmail.com>
Date: Wed, 21 Jun 2017 22:30:26 -0700
To: steve@einval.com
Subject: its time for you to retire from debian...unbelievable..your
         the quality guy and fucked up the installer!

i cant ever remember in the hostory of computing someone releasing an installer
that does not work!!

wtf!!!

you need to be retired...due to being retarded..

and that this was dedicated to ian...what a
disaster..you should be ashames..he is probably roling in his grave from shame
right now....

It's nice to be appreciated.

22:59 :: # :: /misc :: 8 comments

So, Stretch happened...

Things mostly went very well, and we've released Debian 9 this weekend past. Many many people worked together to make this possible, and I'd like to extend my own thanks to all of them.

魅蓝的手机系统是什么？魅蓝能升级安卓5.0吗？-太平洋IT百科:魅蓝能升级安卓5.0吗 魅蓝能升级安卓5.0。 魅蓝此次搭载的是发布会上所提及的Flyme 4.2系统。在照相方面，Flyme 4.2中为广大北方用户提供了一枚特制的“去霾”滤镜，可谓是十分地贴心了。 魅蓝摄像头部分和背盖完美融合，无需担心会刮花等情况。

For my part in the release process, again I was responsible for producing our official installation and live images. Release day itself went OK, but as is typical the process ran late into Saturday night / early Sunday morning. We made and tested lots of different images, although numbers were down from previous releases as we've stopped making the full CD sets now.

蓝灯破解专业版不限速:2021-6-14 · 蓝灯 lantern 专业版有流量限制吗 蓝灯lantern 专业版流量不限.lantern(蓝灯)分为免费版和专业版,免费版一月只有1G的流量,不稳定.专业版流量不限,可支持三个设备登录.网上有很多钓鱼链接,这里附上蓝灯的官网下载链接,购买专业版的时候通过邀请码可众获得额外三个月的使用时长.

Due to a combination of the lack of sleep and the heat, I nearly forgot to even take any photos - apologies to the extra folks who'd been around earlier whom I missed with the camera... :-(

23:21 :: # :: /debian/releases :: 2 comments

灯蓝免费安卓

When you're giving a presentation, the choice of font can matter a lot. Not just in terms of how pretty your slides look, but also in terms of whether the data you're presenting is actually properly legible. Unfortunately, far too many fonts are appallingly bad if you're trying to tell certain characters apart. Imagine if you're at the back of a room, trying to read information on a slide that's (typically) too small and (if you're unlucky) the presenter's speech is also unclear to you (noisy room, bad audio, different language). A good clear font is really important here.

To illustrate the problem, I've picked a few fonts available in Google Slides. I've written the characters "1lIoO0" (that's one, lower case L, upper case I, lower case o, upper case O, zero) in each of those fonts. Some of the sans-serif fonts in particular are comically bad for trying to distinguish between these characters.

It may not matter in all cases if your audience can read all the characters on your slides and tell them apart, put if you're trying to present scientific or numeric results it's critical. Please consider that before looking for a pretty font.

23:08 :: # :: /misc :: 2 comments

Start the fans please!

This probably won't mean much to people outside the UK, I'm guessing. Sorry! :-)

The Crystal Maze was an awesome fun game show on TV in the UK in the 1990s. Teams would travel through differently-themed zones, taking on challenges to earn crystals for later rewards in the Crystal Dome. I really enjoyed it, as did just about everybody my age that I know of...

A group have started up a new 安卓灯蓝专业版下载 attraction in London and Manchester, giving some of us a chance of indulging our nostalgia directly in a replica of the show's setup! Neil NcGovern booked a load of tickets and arranged for a large group of people to go along this weekend.

It was amazing! (Sorry!) I ended up captaining one of the 4 teams, and our team ("Failure is always an option!") scored highest in the final game - catching bits of gold foil flying around in the Dome. It was really, really fun and I'd heartily recommend it to other folks who like action games and puzzle solving.

I just missed the biting scorn of the original show presenter, Richard O'Brien, but our "Maze Master" Boudica was great fun and got us all pumped up and working together.

00:32 :: # :: /misc :: 2 comments

Twenty years...

So, it's now been twenty years since I became a Debian Developer. I couldn't remember the exact date I signed up, but I decided to do some forensics to find out. First, I can check on the dates on my first Debian system, as I've kept it running as a Debian system ever since!

jack:~$ ls -alt /etc
...
-rw-r--r--   1 root   root     6932 Feb 10  1997 pine.conf.old
-rw-r--r--   1 root   root     6907 Dec 29  1996 pine.conf.old2
-rw-r--r--   1 root   root    76739 Dec  7  1996 mailcap.old
-rw-r--r--   1 root   root     1225 Oct 20  1996 fstab.old
jack:~$

I know that I did my first Debian installation in late October 1996, migrating over from my existing Slackware installation with the help of my friend Jon who was already a DD. That took an entire weekend and it was painful, so much so that several times that weekend I very nearly bailed and went back. But, I stuck with it and after a few more days I decided I was happier with Debian than with the broken old Slackware system I'd been using. That last file (fstab.old) is the old fstab file from the Slackware system, backed up just before I made the switch.

I was already a software developer at the time, so of course the first thing I wanted to do once I was happy with Debian was to become a DD and take over the Debian maintenance of mikmod, the module player I was working on at the time. So, I mailed Bruce to ask for an account (there was none of this NM concept back then!) and I think he replied the next day. Unfortunately, I don't have the email in my archives any more due to a disk crash back in the dim and distant past. But I can see that the first PGP key I generated for the sake of joining Debian dates from 安卓灯蓝专业版加速器 which gives me a date of 31st October 1996 for joining Debian.

Twenty years, wow... Since then, I've done lots in the project. I'm lucky enough to been to 11 DebConfs, hosted all around the world. I'm massively proud to have been voted DPL for two of those twenty years. I've worked on a huge number of different things in Debian, from the audio applications I started with to the installer (yay, how things come back to bite you!), from low-level CD and DVD tools (and making our CD images!) to a wiki engine written in python. I've worked hard to help make the best Operating System on the planet, both for my own sake and the sake of our users.

Debian has been both excellent fun and occasionally a huge cause of stress in my life for the last 20 years, but despite the latter I wouldn't go back and change anything. Why? Through Debian, I've made some great friends: in Cambridge, in the UK, in Europe, on every continent. Thanks to you all, and here's to (hopefully) many years to come!

00:17 :: # :: /debian/stats :: 2 comments

Time flies

Slightly belated...

Another year, another OMGWTFBBQ. By my count, we had 49 people (and a dog) in my house and garden at the peak on Saturday evening. It was excellent to see people from all over coming together again, old friends and new. This year we had some weather issues, but due to the delights of gazebo technology most people stayed mostly dry. :-)

火蜂精灵模拟器下载_火蜂精灵模拟器官方下载-太平洋下载中心:2021-6-14 · 火蜂精灵模拟器,火蜂精灵模拟器是一款在免费的安卓模拟器软件，支持安装安卓系统中常见的apk执行文件，包括QQ、抖音等常见生活应用，众及穿越 ...

• Mythic Beasts
• Metail
• Collabora
• Codethink
• 灯蓝专业

As far as I could tell, everybody enjoyed themselves; I know I definitely did!

16:57 :: # :: /debian/uk :: 2 comments

And about time, too!

A couple of weekends back, we had an awesome time at Jonathan and Charlene's wedding. I'd have blogged sooner, but I had to wait for this photo of the happy couple with the Debian gang... :-)

Unfortunately, somebody let Charlene hide at the back! Follow the link for more photos...

14:54 :: # :: 安卓灯蓝专业版加速器 :: 2 comments

Supporting the Software Freedom Conservancy too!

I'm happy to chip in and help the awesome folks at the Software Freedom Conservancy with funding for their work, standing up for copyleft. It's clear that there are a lot of people who will ignore the terms of Free Software licensing, whether by oversight or deliberately, so the SFC are doing an important job working to defend the Freedoms that lots of us are using every day as developers and users.

It seems that some of SFC's corporate supporters have stopped sponsorship since the beginning of their 蓝灯vp:1 天前 · 蓝灯lantern破解版vip无限流量及各版本下载 | 路由器博客 [图文] 网站首页 >游戏助手>蓝灯VIP破解版v3.6.6破解内购专业版 蓝灯VIP破解版v3.6.6破解内购专业版 蓝灯的Android版本怎么用_ 点中间的按钮.选择确定.翻墙成功的话会在通知栏有一个小钥匙的标志. for GPL violations. Maybe some folks are happy to support SFC, but not when they really push things like this. Let's hope that we can find many more individual supporters to cover SFC's funding needs instead. This week, there's an anonymous pledge to match donations from new supporters so right now is an even better time to sign up!

Thanks to Paul Wise for posting about this and indirectly prodding me to sign up too.

21:19 :: # :: /debian/sfc :: 2 comments

Linaro VLANd v0.4

VLANd is a python program intended to make it easy to manage port-based VLAN setups across multiple switches in a network. It is designed to be vendor-agnostic, with a clean pluggable driver API to allow for a wide range of different switches to be controlled together.

There's more information in the README file. I've just released v0.4, with a lot of changes included since the last release:

• Large numbers of bugfixes and code cleanups
• Code changes for integration with LAVA:
  • Added db.find_lowest_unused_vlan_tag()
  • create_vlan() with a tag of -1 will find and allocate the first unused tag automatically
• Add port numbers as well as names to the ports database, to give human-recognisable references. See README.port-numbering for more details.
• Add tracking of trunks, the inter-switch connections, needed for visualisation diagrams.
• Add a simple http-based visualisation feature:
  • Generate network diagrams on-demand based on the information in the VLANd database, colour-coded to show port configuration
  • Generate a simple website to reference those diagrams.
• Allow more ports to be seen on Catalyst switches
• Add a systemd service file for vland

VLANd is Free Software, released under the GPL version 2 (or any later version). For now, grab it from git; tarballs will be coming shortly.

01:44 :: # :: /linaro :: 安卓灯蓝专业版加速器