Technology Tales

Turning off Apport crash reporting on Ubuntu

Last week, I kept getting a multitude of messages from Ubuntu's crash reporting tool, Apport. So many would appear at once on reaching the desktop session during system start-up that I actually downloaded an installation ISO disk image intending to perform a fresh installation to rid myself of the problem. In the end, it never came to that because another remedy produced the result that I needed.

Emptying /etc/crash was a start, but it did not do what I needed, and I disabled Apport altogether. This meant editing its configuration file, which is named apport and is found in /etc/default/. The following command should open it up in Gedit on supplying your password:

gksudo gedit /etc/default/apport

With the file opened, look for the line with enabled=1 and change this to enabled=0. Once that is done, restart Apport as follows:

sudo restart apport

This will need your account password before working, with any messages appearing afterwards. While I would not have done this for a real system problem, my Ubuntu GNOME installation was working smoothly, so it was the remedy I needed. The tool lets Ubuntu developers get information about application crashes, but it sends me to the Ubuntu Launchpad bug reporting website, which requires login details. This is enough to stop me continuing, making me wonder if developers could get what they need without this extra manual step. This would provide them with additional information and give us a more stable operating system in return.

Toggling the appearance or non-appearance of the Firefox session exit dialogue box

One thing that I notice with Firefox installations in both Ubuntu and Linux Mint is that a dialogue box appears when closing down the web browser asking whether to save the open session or if you want to have a fresh session the next time that you start it up. Initially, I was always in the latter camp, but there are times when I took advantage of that session saving feature for retaining any extra tabs containing websites to which I intend to return or editor sessions for any blog posts that I am still writing; sometimes, composing the latter can take a while.

To see where this setting is located, you need to open a new tab and type about:config in the browser's address bar. This leads to advanced browser settings, so you need to click OK, answering a warning message, before proceeding. Then, start looking for browser.showQuitWarning using the Search bar; it acts like a dynamic filter on screen entries until you get what you need. On Ubuntu and Linux Mint, the value is set to true but false is the default elsewhere; unlike Opera, Firefox generally does not save sessions by fault unless you tell it to that (at least, that has been my experience anyway). Setting true to false or vice versa will control the appearance or non-appearance of the dialogue box at browser session closure time.

Turning off Advanced Content Filtering in CKEditor

On one of my websites, I use Textpattern with CKEditor for editing of articles on there. This was working well until I upgraded CKEditor to a version with a number of 4.1 or newer because it started to change the HTML in my articles when I did not want it to do so, especially when it broke the appearance of the things. A search on Google revealed an unhelpful forum exchange that produced no solution to the issue so I decided to share one on here when I found it.

What I needed to do was switch off what is known as Advanced Content Filtering. It can be tuned but I felt that would take too much time so I implemented something like what you see below in the config.js with the ckeditor folder:

CKEDITOR.editorConfig = function( config ) {
config.allowedContent = true;
};

All settings go with the outer function wrapper and setting the config.allowedContent property to true within there sorted my problem as I wanted. Now, any HTML remains untouched and I am happy with the outcome. It might be better for features like Advanced Content Filtering to be switched off by default and turned on by those with the time and need for it, much like the one of the principles adopted by the WordPress project. Still, having any off switch is better than none at all.

Migrating a virtual machine from VirtualBox to VMware Player on Linux

The progress of Windows 10 is something that I have been watching. Early signs have been promising, and the most recent live event certainly contained its share of excitement. The subsequent build that was released was another step in the journey, though the new Start Menu appears more of a work in progress than it did in previous builds. Keeping up with these advances sometimes steps ahead of VirtualBox support for them, and I discovered that again in the last few days. VMware Player seems unaffected, so I thought that I'd try a migration of the VirtualBox VM with Windows 10 onto there. In the past, I did something similar with a 32-bit instance of Windows 7 that subsequently got upgraded all the way up to 8.1, but that may not have been as slick as the latest effort, so I thought that I would share it here.

The first step was to export the virtual machine as an OVF appliance, and I used File > Export Appliance... only to make a foolish choice regarding the version of OVF. The one that I picked was 2.0 only to subsequently discover that 1.0 was the better option. The equivalent command line would look like the following (there are two dashes before the ovf10 option below):

VboxManage export [name of VM] -o [name of file].ova --ovf10

VMware has a tool for extracting virtual machines from OVF files that will generate a set of files that will work with Player and other similar products of theirs. It goes under the unsurprising name of OVF Tool and usefully works from a command line session. When I first tried it with an OVF 2.0 files, I got the following error, and it stopped doing anything as a result:

Line 2: Incorrect namespace http://schemas.dmtf.org/ovf/envelope/2 found.

The only solution was to create a version 1.0 file and use a command like the following:

ovftool --lax [name of file].ova [directory location of VM files]/[name of file].vmx

The --lax option is needed to ensure successful execution, even with an OVF 1.0 file as the input. Once I had done this on my Ubuntu GNOME system, the virtual machine could be opened up on VMware Player and I could use the latest build of Windows 10 at full screen, something that was not possible with VirtualBox. This may be how I survey the various builds of the operating that appear before its final edition is launched later this year.

Fixing Windows Update errors by clearing the SoftwareDistribution folder

Following a recent family death, I have ended up with the laptop belonging to the deceased and, since it has been offline most of its life, I set to getting it updated. The McAfee security suite was straightforward enough but trying Windows Update produced errors suggesting that it was not working and that a system restart was needed. Doing that did nothing, so a little further investigation was needed.

The solution turned out to be stopping the Windows Update service and clearing a certain folder before starting it again. To stop the service, I typed in services.msc into the search box on the Start Menu and clicked on the entry that appeared, which was called Services. Then I sought out the Windows Update entry, selected it and clicked on the Stop link on the left-hand side. After that, I used Windows Explorer to navigate C:\Windows\SoftwareDistribution and deleted everything in there. The, I went back to the Services window and started Windows Update again. That sorted the problem and the system began to be updated as needed.

All of this was on Windows 7, hence the mention of the Start Menu, and the machine is a Toshiba Satellite C660 from 2011 with an AMD E-300 APU, 4 GB of RAM and a 320 GB hard drive. Those specs may not be the most impressive, but it feels spritely enough and is far better than the lethargic Toshiba Equium A200-1VO that I acquired in 2008, though the HP Pavilion dm4 that I bought in November 2011 probably will travel more often than either of these if truth be told. After all, it now has 8 GB of RAM and a 1 TB Samsung SSHD along with its Core i3 CPU, so it should serve me for a while yet.

Upgrading a 2012 Google Nexus 7 to Android 5.0

Today, I was lured into upgrading my 2012 Google (ASUS) Nexus 7 to the final version of Android 5.0 (also known as Lollipop) by an icon in the device's top panel. Initially, it felt as it was working OK but a certain sluggish could not be overlooked and there have been complaints about this with some questioning the sense of what Google has done. However, there would have been remarks about grandfathering the device if they had not left us to have the latest release of Android, so there was no victory either way. We humans are fickle creatures, and there is an example of exactly that in a well observed double-ended short story by the Irish writer Maura Laverty.

While my impressions of how the upgrade had lumbered the tablet had me wondering about replacing the thing with either an Apple iPad Mini 2 or a Google (HTC) Nexus 9, a much less expensive option came to mind: doing a full factory reset of the device using its recovery mode. Though that may sound drastic, much of what I had on there was in the cloud anyway, so there was nothing to lose. So these are the instructions from Google themselves and I will leave you to use them at your own risk:

1. If your tablet is on, turn it off.
2. Press and hold the Volume Down button, then press and hold the Power button at the same time until the tablet turns on. You'll see the word "Start" with an arrow around it.
3. Press the Volume Down button twice to highlight "Recovery mode".
4. Press the Power button to start Recovery mode. You'll see an image of an Android robot with a red exclamation mark and the words "No command."
5. While holding down the Power button, press the Volume Up button.
6. Use the volume buttons to scroll to "wipe data/factory reset," then press the Power button to select it.
7. Scroll down to "Yes - erase all user data," then press the Power button to select it.

Note: If your tablet becomes unresponsive at any point during these steps, you can restart it by holding down the Power button for several seconds.

Once that was completed and the tablet restarted, the set-up routine began and took around an hour to reinstate the various apps that had been lost by the rest. Much of that was down to the time taken for re-installation rather than that taken by the actual downloads themselves over a wired broadband connection. The wait was worth it because the Nexus 7 feels more responsive again. While there are times when little lags are noticeable, they are nothing next to the slowdown that I had witnessed before the rest. It might have been a better option than attempting to return to Android 4.4.4 using a factory image, which was another option that I was considering. So long as there is no deterioration in speed, the effort expended to do a reset will have been worthwhile.

Smarter file renaming using PowerShell

It appears that the Rename-Item commandlet in PowerShell is a very useful tool when it comes to smarter renaming of files. Even text substitution is a possibility, and what follows is an example that takes the output of the Dir command for listing the files in a directory and replaces hyphens with underscores in each one.

Dir | Rename-Item –NewName { $_.name –replace “-“,”_” }

The result is that something like the-file.txt becomes the_file.txt. This behaviour is reminiscent of the rename command found on Linux and UNIX systems, where regular expressions can be used, like in the following example that has the same result as the above:

rename 's/-/_/g' *

In both cases, you do need to be careful as to what files are in a directory for this, though the wildcard syntax on Linux or UNIX will be more familiar to anyone who has worked with files via almost any command line. Another thing to watch in the UNIX world is that * parses the whole directory structure, and that could be something that is not wanted for much of the time.

All of this is a far cry from the capabilities of the ren or rename command used in the days of MS-DOS and what has become the legacy Windows command line. Apart from simple renaming, any attempt at tweaking a filename through substitution ended up with the extra string getting appended to filenames when I tried it. Thus, the PowerShell option looks better in comparison.

Initial impressions of Windows 10

Being ever curious on the technology front, the release of the first build of a Technical Preview of Windows 10 was enough to get me having a look at what was on offer. The furore regarding Windows 8.x added to the interest, so I went to the download page to get a 64-bit installation ISO image.

That got installed into a fresh VirtualBox virtual machine and the process worked smoothly to give something not so far removed from Windows 8.1. However, it took until release 4.3.18 of VirtualBox before the Guest additions had caught up with the Windows prototype, so I signed up for the Windows Insider program and got a 64-bit ISO image to install the Enterprise preview of Windows 10 into a VMware virtual machine since and that supported full screen display of the preview while VirtualBox caught up with it.

Of course, the most obvious development was the return of the Start Menu, and it works exactly as expected too. Initially, the apparent lack of an easy way to disable App panels had me going to Classic Shell for an acceptable Start Menu. It was only later that it dawned on me that unpinning these panels would deliver to me the undistracting result that I wanted.

Another feature that attracted my interest is the new virtual desktop functionality. Here I was expecting something like what I have used on Linux and UNIX. There, each workspace is a distinct desktop, with only the applications open in a given workspace showing on a panel in there. Windows does not work that way with all applications visible on the taskbar regardless of what workspace they occupy, which causes clutter. Another deficiency is not having a desktop indicator on the taskbar instead of the Task View button. On Windows 7 and 8.x, I have been a user of VirtuaWin and this still works largely in the way that I expect of it too, except for any application windows that have some persistence associated with them; the Task Manager is an example and I include some security software in the same category too.

Even so, here are some keyboard shortcuts for anyone who wants to take advantage of the Windows 10 virtual desktop feature:

• Create a new desktop: Windows key + Ctrl + D
• Switch to previous desktop: Windows key + Ctrl + Left arrow
• Switch to next desktop: Windows key + Ctrl + Right arrow

Otherwise, stability is excellent for a preview of a version of Windows that is early on its road to final release. An upgrade to a whole new build went smoothly when initiated following a prompt from the operating system itself. All installed applications were retained, and a new taskbar button for notifications made its appearance alongside the existing Action Centre icon. So far, I am unsure what this does and whether the Action Centre button will be replaced in the fullness of time, yet I am happy to await where things go with this.

All is polished up to now, and there is nothing to suggest that Windows 10 will not be to 8.x what 7 was to Vista. The Start Screen has been dispatched after what has proved to be a misadventure for Microsoft. Regardless of what was hyped a few years ago, the PC still is with us; touchscreen devices like tablets are augmenting it instead of replacing it for any tasks involving some sort of creation. If anything, we have seen the PC evolve with laptops perhaps becoming more like the Surface Pro, at least when it comes to hybrid devices. However, we are not as happy to smudge our PC screens quite like those on phones and tablets, so a return to a more keyboard and mouse centred approach for some devices is welcome.

What I have here are just a few observations; there are more elsewhere, including a useful article by Ed Bott on ZDNet. All in all, we are early in the process for Windows 10 and, though it looks favourable so far, I will continue to keep an eye on how it progresses. The need to be less experimental than Windows 8.x is being fulfilled: so far, it certainly is less schizophrenic and should not be a major jump for users of Windows 7.

Changing file timestamps using Windows PowerShell

Recently, a timestamp got changed on an otherwise unaltered file on me and I needed to change it back. Luckily, I found an answer on the web that used PowerShell to do what I needed, and I am recording it here for future reference. The possible commands are below:

$(Get-Item temp.txt).creationtime=$(Get-Date "27/10/2014 04:20 pm")
$(Get-Item temp.txt).lastwritetime=$(Get-Date "27/10/2014 04:20 pm")
$(Get-Item temp.txt).lastaccesstime=$(Get-Date "27/10/2014 04:20 pm")

The first of these did not interest me, since I wanted to leave the file creation date as it was. The last write and access times were another matter because these needed altering. The Get-Item commandlet brings up the file, so its properties can be set. Here, these include creationtime, lastwritetime and lastaccesstime. The Get-Date commandlet reads in the provided date and time for use in the timestamp assignment. While PowerShell itself is case-insensitive, I have opted to show the camel case that is produced when you are tabbing through command options for the sake of clarity.

The Get-Item and Get-Date have aliases of gi and gd, respectively, and the Get-Alias commandlet will show you a full list while Get-Command (gcm) gives you a list of commandlets. Issuing the following gets you a formatted list that is sent to a text file:

gcm | Format-List > temp2.txt

There is some online help, but it is not quite as helpful as it ought to be, so I have popped over to Microsoft Learn whenever I needed extra enlightenment. Here is a command that pops the full thing into a text file:

Get-Help Format-List -full > temp3.txt

In fact, getting a book might be the best way to find your way around PowerShell because of all its commandlets and available objects.

For now, other commands that I have found useful include the following:

Get-Service | Format-List
New-Item -Name test.txt -ItemType "file"

The first of these gets you a list of services, while the second creates a new blank text file for you, and it can create new folders for you too. Other useful commandlets are below:

Get-Location (gl)
Set-Location (sl)
Copy-Item
Remove-Item
Move-Item
Rename-Item

The first of the above is like the cwd or pwd commands that you may have seen elsewhere, in that the current directory location is given. Then, the second will change your directory location for you. After that, there are commandlets for copying, deleting, moving and renaming files. These also have aliases, so users of the legacy Windows command line or a UNIX or Linux shell can use something that is familiar to them.

Little fixes like the one with which I started this piece are all good to know, but it is in scripting that PowerShell really is said to show its uses. Having seen the usefulness of such things in the world on Linux and UNIX, I cannot disagree with that, and PowerShell has its own IDE too. That may be just as well, given how much there is to learn. That especially is the case when you might need to issue the following command in a PowerShell session opened using the Run as Administrator option just to get the execution as you need it:

Set-ExecutionPolicy RemoteSigned

Issuing Get-ExecutionPolicy will show you if this is needed when the response is: Restricted. A response of RemoteSigned shows you that all is in order, though you need to check that any script you then run has no nasty payload in there, which is why execution is restrictive in the first place. This sort of thing is yet another lesson to be learnt with PowerShell.

A collection of legal BitTorrent sites

It was an article in a magazine that revealed these legal BitTorrent download sites to me, so I thought that I'd keep them on file for future reference while also sharing them with others who might need them. As far as I am aware, they are all legal in that no copyrighted material is on there. If that changes, I am happy to know and make amendments as needed.

My own interest in torrents arises from their being a convenient way to download installation disk images for Linux distributions, and at least one of the entries is devoted to just that. However, the distribution also lends itself to movies along with music and books, so that is reflected below too. Regarding downloading actual multimedia content, there is so much illegal downloading that a list like this is needed and has blackened the reputation of BitTorrent too because it only ever was conceived as a means for distributing large files in a peer-to-peer manner without the use of a single server. Of course, any use can be found for a technology, and it never has to be legal or morally acceptable either.

Archive.org

Bt.etree.org

FrostClick

Linux Tracker

Public Domain Torrents