January 2017 - wlug - list.wlug.org.nz

An Ordinary User’s Adventures In Linux
by Lawrence D'Oliveiro 30 Sep '17

30 Sep '17

I helped an elderly friend set up his new PC yesterday. His previous machine, over a decade old, was running Windows XP. I had set up an Ubuntu dual-boot a few years back, and he liked playing the games. But then the Linux boot stopped working--there was a message to the effect “hd0 out of disk”, which sounded like a GRUB problem (“hd0” being a GRUB disk name, not a Linux disk name). I booted up SystemRescueCD, and found that disk space was ample. I did an fsck on the Linux volume, and found no filesystem problems. I ran a badblocks scan, and it reported several bad sectors, though oddly they only seemed to be in the Windows partition (if I interpreted the numbers correctly). Naturally I searched online, but the hits I found for that error message didn’t seem very helpful. Reinstalling GRUB didn’t help, so I concluded there were likely other hardware problems, so time for a new machine. He got an entry-level dual-core AMD box from PBTech--their own house build, in a CoolerMaster case--for well under a grand. Nothing fancy, but good enough for his needs--mainly Web browsing, e-mail, a little bit of word processing, and those games. The PBTech box came without an OS. He could have got Windows 10 for it, but considering he would be facing a learning curve coming from XP regardless, I suggested going 100% Linux for all his daily needs, to see if that would work. He could always spend the $160-odd extra on Windows later if need be. So I set it up with Linux Mint, since that seems to be everybody’s favourite :). He was already using Firefox on Windows, so moving all his Web bookmarks across was easy. The Mint install put an icon for Thunderbird on the desktop by default, so I decided to try that for e-mail. Getting his address book across from Outlook Express was fairly straightforward, once I figured out how to map the exported CSV field names correctly. The mail messages were slightly more fiddly, but I found this extension <https://addons.mozilla.org/en-US/thunderbird/addon/importexporttools/> which directly loads Microsoft’s .dbx files, and that seemed to work OK. Then he wanted to play CDs. When we put in an audio CD, it came up with options to run Banshee (media player) or Brasero (disc burner). The Banshee media player wouldn’t play the CD directly, it insisted on ripping it to the hard drive first. This was not really what he wanted. I had a look round, and found KsCD, which will indeed play audio CDs without trying to rip them to audio files first. As far as I know, this is the only GUI Linux app that can do so. So, day 1 ended on a reasonably successful note. He was already noticing how much faster the new machine was. So we’ll see how it goes from here...

5 13

Look before you paste from a website to terminal
by Peter Reutemann 11 Mar '17

11 Mar '17

'Most of the time when we see a code snippet online to do something, we often blindly copy paste it to the terminal. Even the tech savy ones just see it on the website before copy pasting. Here is why you shouldn't do this.' -- source: https://lifepluslinux.blogspot.co.nz/2017/01/look-before-you-paste-from-web… Hint: hidden commands thanks to HTML/CSS. Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

3 2

25G/50G Ethernet
by Lawrence D'Oliveiro 06 Feb '17

06 Feb '17

Thought there already was a 100-gigabit-per-second Ethernet spec. But it seems that still isn’t quite practical enough (cost? range?) for common use. Nor is the 40-gigabit-per-second fallback. So here we have two more lesser specs: <http://www.theregister.co.uk/2017/01/31/25g_and_50g_ethernet_spec_finalised/>.

1 1

Gitlab Backups ... What Backups?
by Lawrence D'Oliveiro 02 Feb '17

02 Feb '17

A harried sysadmin accidentally deletes nearly 300GB of data during a troublesome data replication process ... and then they discover that, out of 5 different recovery procedures they thought they had available, none work. <http://www.theregister.co.uk/2017/02/01/gitlab_data_loss/>

2 2

System76 GPGPU Server
by Lawrence D'Oliveiro 01 Feb '17

01 Feb '17

System76 announces its new Ibex Pro box <http://www.phoronix.com/scan.php?page=news_item&px=System76-Ibex-Pro-GPU-Se…> which can hold up to nearly 40,000 NVidia CUDA cores <https://system76.com/servers/ibex>. Not sure how many you get for that USD9,575 base price... Seems like there is no really competitive market for GPGPU hardware--it is totally dominated by NVidia, and nobody else gets a serious look-in. So the industry-standard OpenCL API languishes, since the dominant player prefers its own proprietary alternative, and there is little pressure from users to be able to port their code to competing products.

1 0

Google AI on raspberry pi
by rowan schischka 31 Jan '17

31 Jan '17

"Google has developed a huge range of tools for machine learning, IoT, wearables, robotics, and home automation, and it wants Raspberry Pi fans to fill out a survey <https://google.qualtrics.com/jfe/form/SV_3yMNYryaP4WsCwJ?Source=RaspPi> that will help it to understand what tools to provide." http://www.zdnet.com/article/google-is-bringing-ai-to-your-raspberry-pi/ I just took the survey and I don't get any impression of what tools they will bring to the r-pi. It was pretty simple, no email address required to participate. The questions were how old are you, what area are your projects in, and how frequently do you work on your projects. Im sure with the processing power of r-pi we'll see some sort of web API which wouldn't really need to be specific to the r-pi. It will be interesting to watch what they come up with so if you have maker projects, take the survey. -- Rowan Schischka

1 0

Backblaze 2016 Hard Drive Report
by Lawrence D'Oliveiro 31 Jan '17

31 Jan '17

<https://arstechnica.com/information-technology/2017/01/8tb-hgst-disks-show-…>: Traditionally, the company has stuck with consumer-oriented disks. Backblaze argues that the extra cost of "enterprise" disks doesn't make sense for its usage pattern. Other studies have shown no significant difference in reliability between “enterprise” and “consumer” disks anyway.

2 2

USB-C Power Meter
by Lawrence D'Oliveiro 31 Jan '17

31 Jan '17

With all the worries over bad USB-C cables and vendors that play fast and loose with the power spec, here <https://arstechnica.co.uk/gadgets/2017/01/usb-c-power-meter/> is a measurement gadget that can help to some extent. But as the article says: If you really want to test a new charger or cable before plugging it into an expensive device, your best bet is some DIYish electronics involving a breakout board and a multimeter. But there doesn't seem to be a plug-and-play version of that yet.

1 0

The Trump-And-Dump Bot
by Lawrence D'Oliveiro 30 Jan '17

30 Jan '17

This bot <http://www.theregister.co.uk/2017/01/30/trumps_corporate_twitter_trolling_t…> analyzes Trump’s tweets, identifies the company he is badmouthing, and does a quick short-sell to profit from the momentary dip in the company’s stock value. T3's approach involves using a Python Twitter bot and API calls to services like Indico for machine learning (sentiment analysis and entity recognition), Clearbit for company identification, Google Finance for stock pricing, and E‑Trade for executing the trade. They have been donating the profits to charity. Imagine that--an ethical use for short-selling...

1 0

Windows Users: It Might Be Time To Stop Using Antivirus
by Lawrence D'Oliveiro 27 Jan '17

27 Jan '17

The nail in the coffin, according to O'Callahan, is that software vendors rarely speak out about antivirus issues "because they need cooperation from the AV vendors." He then links to a mailing list thread in 2012, where he suggests keeping a list of the AV software that interferes with Firefox. Later in the thread, Mozilla PR swoops in and tells him to knock it off. <https://arstechnica.com/information-technology/2017/01/antivirus-is-bad/>

1 0

Code-Signing Vs Software Developers
by Lawrence D'Oliveiro 26 Jan '17

26 Jan '17

This item <http://www.theregister.co.uk/2017/01/26/windows_code_signing_changes/> is about Microsoft adopting some recommendations from the “Certificate Authority Security Council” that code-signing keys should be embedded in special hardware devices, not simply kept as files on a regular computer. Apparently they are also suggesting some yet-to-be-defined “cloud-based service” as an alternative, which raises some questions. One of the commenters linked this article <http://www.pcworld.com/article/2846653/storage-for-spies-how-the-fips-stand…> which gives a good overview of hardware signing key devices that are certified to the various levels of the FIPS 140-2 standard. The idea is not a new one. But like most security techniques that are worth a darn, it can cause all kinds of irritations in practical use.

1 0

KDE-Branded Laptop
by Lawrence D'Oliveiro 26 Jan '17

26 Jan '17

Announcing ... the KDE Slimbook <http://phoronix.com/scan.php?page=news_item&px=KDE-Slimbook-Laptop>.

2 1

why ifconfig may not work these days
by Ian Young 26 Jan '17

26 Jan '17

>From time to time I find myself wondering where *ifconfig* has gone. This article may provide the answer. https://lwn.net/Articles/710533/ See also: http://baturin.org/docs/iproute2/

2 1

Mossberg: What?s up with Firefox, the browser that time forgot?
by rowan schischka 26 Jan '17

26 Jan '17

Happy new year everybody. Somehow i missed the first meeting. For the next one could we do a live benchmark of web browsers available on linux? Theres a couple of things to consider such as: how quickly new browser versions are available - security updates accuracy of rendering - i have found Midori feels fast but does not display some web pages the same as others Theres also flash and HTML5 we could look into. A few years ago (around 2010/2011) I made a simple HTML5 canvas with some animations that looked like a space invaders game, from memory, on debian i had the following results: IE, can't remember version, got around 20 fps chrome scored 120 something fps firefox received around 12 fps I dont know what benchmarks are available for us to use but it would be interesting, it would also be interesting to look at comparing browsers on fedora and ubuntu -- Kind Regards Rowan Schischka

2 1

Mossberg: What’s up with Firefox, the browser that time forgot?
by Peter Reutemann 25 Jan '17

25 Jan '17

'Until about five years ago, techies and others who wanted a speedier, extensible, more privacy-oriented web browser on their desktops often immediately downloaded Mozilla's Firefox to use instead of Internet Explorer on Windows or Safari on the Mac. But those days seem long ago. Firefox is hardly discussed today, and its usage has cratered from a high of over 30 percent of the desktop browser market in 2010 to about 12 percent today, according to Mozilla, citing stats from NetMarketShare. (Various other analytics firms put the share as low as 10 percent or as high as 15 percent.) And Firefox’s share on mobile devices is even worse, at under 1 percent, according to the same firm. Today, the go-to-browser is Google’s Chrome, which has over a 50 percent share on both desktop and mobile, according to NetMarketShare.' -- source: http://www.theverge.com/2017/1/25/14376710/walt-mossberg-mozilla-firefox-br… Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

1 0

AdNauseam, Google, And The Myth Of The “Acceptable Ad”
by Lawrence D'Oliveiro 24 Jan '17

24 Jan '17

[AdNauseam 3.0] contains some new features we’ve been excited to discuss with users and critics, but the discussion was quickly derailed when we learned that Google had banned AdNauseam from its store, where it had been available for the past year. We also learned that Google has disallowed users from manually installing or updating AdNauseam on Chrome, effectively locking them out of their own saved data, all without prior notice or warning. <http://freedom-to-tinker.com/2017/01/24/adnauseam-google-and-the-myth-of-th…>

1 0

Zorin distro reviewed on Distrowatch
by Ian Young 24 Jan '17

24 Jan '17

For a more detailed appraisal of Zorin than was possible at the last meeting see issue 695 of Distrowatch Weekly. http://distrowatch.com/weekly.php?issue=20170116#zorin See also with reference to Fedora a derivative called Korora bubbling under at 49 on Distrowatch. Tracks Fedora releases without much delay. Korora is a little blue penguin. 'Korora was born out of a desire to make Linux easier for new users, while still being useful for experts. The main goal of Korora is to provide a complete, easy-to-use system for general computing. Originally based on Gentoo Linux in 2005, Korora was re-born in 2010 as a Fedora Remix with tweaks and extras to make the system "just work" out of the box.'

1 0

Asus Tinker Board
by Lawrence D'Oliveiro 23 Jan '17

23 Jan '17

Quad-core ARM-based board with more powerful GPU with 4K video capability, also 24-bit audio, and the site linked to quotes a price of about £46+VAT, so not too far off competing with the Raspberry π. Except it’s 32-bit only. <http://arstechnica.com/gadgets/2017/01/asus-tinker-board-price-specs-releas…>

1 0

Already on probation, Symantec issues more illegit HTTPS certificates
by Peter Reutemann 23 Jan '17

23 Jan '17

'A security researcher has unearthed evidence showing that three browser-trusted certificate authorities (CAs) owned and operated by Symantec improperly issued more than 100 unvalidated transport layer security certificates. In some cases, those certificates made it possible to spoof HTTPS-protected websites.' -- source: http://arstechnica.com/security/2017/01/already-on-probation-symantec-issue… Cheers, Peter -- Peter Reutemann Dept. of Computer Science University of Waikato, NZ +64 (7) 858-5174 http://www.cms.waikato.ac.nz/~fracpete/ http://www.data-mining.co.nz/

1 0

Learn-To-Code Site Code.org Loses Student Work Due To Index Bug
by Lawrence D'Oliveiro 23 Jan '17

23 Jan '17

For your revision this week: understanding integer overflow. <http://www.theregister.co.uk/2017/01/22/code_dot_org_index_bug_wiped_studen…>

1 0

New Term To Scare You With: “Line Of Death”
by Lawrence D'Oliveiro 20 Jan '17

20 Jan '17

... a.k.a. the demarcation between pixels in a web browser window that the user can trust, and those they can’t. And how every new advance in “user experience” seems calculated to weaken this line. Another lovely new term: “picture-in-picture phishing attack”. <http://www.theregister.co.uk/2017/01/19/browser_line_of_death/>

1 0

SporeStack: Anonymous, Disposable Servers
by Lawrence D'Oliveiro 19 Jan '17

19 Jan '17

Paid for with Bitcoin: <http://www.theregister.co.uk/2017/01/19/disposable_servers_available_anonym…>.

1 0

Microsoft-Owned Minecraft No Longer Supported On Microsoft-Owned Windows Phone/Mobile
by Lawrence D'Oliveiro 19 Jan '17

19 Jan '17

<http://arstechnica.com/gaming/2017/01/microsoft-owned-minecraft-no-longer-s…>: In the meantime, however, the game stands as yet another anomaly in the company's approach to software development. It isn't following the rules it suggests that others should obey, and third-party platforms—including the relatively rarely used Fire OS—are seeing stronger software support than the company's own. This tendency to offer better support for non-Windows systems continues to annoy Windows fans, and the failure to capitalize on the universal-ness of UWP leads developers to wonder, "If Microsoft isn't consistently writing universal apps, why should we?"

2 2

Big Astronomy Destroys Big Data
by Lawrence D'Oliveiro 18 Jan '17

18 Jan '17

<http://www.theregister.co.uk/2017/01/18/murchison_radiotelescope_opens_the_…>: A curious detail in the CSIRO blog post caught Vulture South's eye: ASKAP is producing 5.2 TB per second of data, which the CSIRO reckons is equivalent to about 15 per cent of the current data rate for the whole of the Internet. That's bigger, by a nice fat margin, than two things: the connection from Murchison to the Pawsey supercomputer centre in Perth; the amount of disk available once the data arrives in Perth. Clearly, there's a serious amount of data reduction happening along the way... In short, 5.2TB/s of raw data in, 22MB/s of high-res image data out. The latter is what’s stored for further processing.

1 0

Project Isambard To Test Feasibility Of An ARM-Based Supercomputer
by Lawrence D'Oliveiro 18 Jan '17

18 Jan '17

Four UK universities will build a 10,000+-core ARM super to determine whether such a beast can beat the usual Xeon-based beasties on price/performance. There’s a suggestion of support for other architectures for comparison purposes as well. <http://www.theregister.co.uk/2017/01/18/arm_met_office_hpc/>

1 0