Recently the Software Center started crashing on startup. Initially I thought it was due to network issues, but after a further examination it turned out not to be the case.
Running it from the panel will not give you any feedback about why it crashes, so I executed it command line to see what is going on:
That produced the following output:
2012-05-23 09:47:04,729 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None' 2012-05-23 09:47:04,732 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True 2012-05-23 09:47:04,926 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file 2012-05-23 09:47:05,129 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open() Traceback (most recent call last): File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 243, in open self._cache = apt.Cache(GtkMainIterationProgress()) File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 102, in __init__ self.open(progress) File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 145, in open self._cache = apt_pkg.Cache(progress) SystemError: E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_precise_multiverse_binary-amd64_Packages, E:The package lists or status file could not be parsed or opened. 2012-05-23 09:47:06,770 - softwarecenter.db.enquire - ERROR - _get_estimate_nr_apps_and_nr_pkgs failed Traceback (most recent call last): File "/usr/share/software-center/softwarecenter/db/enquire.py", line 115, in _get_estimate_nr_apps_and_nr_pkgs tmp_matches = enquire.get_mset(0, len(self.db), None, xfilter) File "/usr/share/software-center/softwarecenter/db/appfilter.py", line 89, in __call__ if (not pkgname in self.cache and File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 263, in __contains__ return self._cache.__contains__(k) AttributeError: 'NoneType' object has no attribute '__contains__' Traceback (most recent call last): File "./software-center", line 176, in
app.run(args) File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1343, in run self.show_available_packages(args) File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 1273, in show_available_packages self.view_manager.set_active_view(ViewPages.AVAILABLE) File "/usr/share/software-center/softwarecenter/ui/gtk3/session/viewmanager.py", line 149, in set_active_view view_widget.init_view() File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/availablepane.py", line 168, in init_view self.apps_filter) File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 240, in __init__ self.build(desktopdir) File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 491, in build self._build_homepage_view() File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 266, in _build_homepage_view self._append_whats_new() File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 430, in _append_whats_new whats_new_cat = self._update_whats_new_content() File "/usr/share/software-center/softwarecenter/ui/gtk3/views/catview_gtk.py", line 419, in _update_whats_new_content docs = whats_new_cat.get_documents(self.db) File "/usr/share/software-center/softwarecenter/db/categories.py", line 124, in get_documents nonblocking_load=False) File "/usr/share/software-center/softwarecenter/db/enquire.py", line 317, in set_query self._blocking_perform_search() File "/usr/share/software-center/softwarecenter/db/enquire.py", line 212, in _blocking_perform_search matches = enquire.get_mset(0, self.limit, None, xfilter) File "/usr/share/software-center/softwarecenter/db/appfilter.py", line 89, in __call__ if (not pkgname in self.cache and File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 263, in __contains__ return self._cache.__contains__(k) AttributeError: 'NoneType' object has no attribute '__contains__'
As you can see in the SystemError part, it seems to have an issue with the one of the repository lists in /var/lib/apt/lists/, so the natural solution as this post suggests is to remove the one it is complaing about or better yet, remove all and run apt-get update to create them again:
sudo rm -rf /var/lib/apt/lists/* sudo apt-get update
You should be good to go…
By default Ubuntu’s vim utility is configured to color code certain keywords, comments, extensions, etc.
I personally do not like this. So I just disable that feature. And while I am at it, I also enable the ruler, which displays the line number and the character position of the cursor.
To do that for all users, edit the /etc/vim/vimrc file add the following lines to it:
syntax off " Clear any font/color/hilighting set ruler " Enable the ruler
If you want to do that just for a particular user, create a .vimrc file in that user’s home directory (if it does not already exist) and add the same lines to it.
Ath9k is the latest wireless driver for the newer Atheros chipsets and just like the MadWifi driver could be used to put your NIC in a promiscuous mode, do packet injection, etc. in order to crack WEP.
Check the compatibility of your wireless NIC first.
To find out what kind of chipset you have, run:
lspci | grep -i wireless
The ath9k driver is present in any kernel starting with version 2.6.27. The oldest supported ath9k version comes with kernel 2.6.32. That means most likely you already have the driver and there is no need to download it, all you have to do is enable it.
The general steps in order to enable ath9k are:
- Get the kernel source and some necessary packages
- Configure the kernel
- Compile and install the kernel
- Configure grub to boot from the new kernel image
Some steps might sound a bit intimidating, but actually they are very easy to do.
Since you will be running a lot of commands as root, it would be more convenient to open a bash shell as root instead of preceding all commands with sudo. The easiest way to do this is to run the following command it terminal:
$ sudo bash
Note: The above command has nothing to do with enabling the root login. I strongly recommend to never enable the root login due to serious security risks! Some blogs might ask you to do that, but there is hardly ever any reason to do this.
1. Get the kernel source and some necessary packages
# aptitude install git-core build-essential kernel-package qt3-dev-tools libqt3-mt-dev fakeroot # apt-get install linux-source
The above command downloaded the kernel source tarball in /usr/src.
In my case the kernel version I am working with is 2.6.32 (patch level 15). Replace these numbers with the version of your kernel source.
Now lets cd to the place we downloaded the kernel source:
# cd /usr/src
Uncompress and extract the kernel source:
# tar xjvf linux-source-2.6.32.tar.bz2 # cd linux-source-2.6.32
2. Configure the kernel
Before configuring the kernel, lets import the configuration of the currently running kernel. This way we do not miss to enable something we currently have and need:
# cp -vi /boot/config-`uname -r` .config
Now we are ready to add a few configurations to the kernel:
# make xconfig
This opens up an xwindow with a hierarchical structure representing the kernel settings:
First enable mac80211:
Networking ---> Wireless --->
Improved wireless configuration API Generic IEEE 802.11 Networking Stack (mac80211)
You can then enable ath9k in the kernel configuration under:
Device Drivers ---> [*] Network device support ---> Wireless LAN --->
Atheros 802.11n wireless cards support
If you re-used the existing configuration, note that Ubuntu kernels build with debugging information on, which makes the resulting kernel modules (*.ko files) much larger than they would otherwise be. To turn this off, go into “Kernel hacking”; then, under “Kernel debugging”, turn OFF “Compile the kernel with debug info”.
Save changes and exit.
3. Compile and install the kernel
First, let’s ensure a “clean” build:
# make-kpkg clean
Since the kernel compilation might take some time, it is best to set the CONCURRENCY_LEVEL variable, so that it can take a full advantage of the multiple processors or mulitple CPU cores on the machine. The CONCURRENCY_LEVEL variable is equal to the number of processors on the machine plus one. So if your machine has a dual core processor the variable will be equal to 3. To find out how many processors or cores your computer has run:
# lshw -C CPU
In my case I get cpu:0 and cpu:1, which means that I have a dual core processor.
Besides the CONCURRENCY_LEVEL, the only other thing we need to pay attention to here is the “–append-to-version” option. It basically adds that string to the end of the kernel name and could be set to anything. That gives you the opportunity to put there something meaningful to distingush the kernel from the other ones. In this case I called it “-mykernel”.
Now you are ready to compile:
# CONCURRENCY_LEVEL=3 fakeroot make-kpkg --initrd --append-to-version=-mykernel kernel-image kernel-headers
If you want to see the ubuntu splash screen (or use text mode) before you get to X instead of just a black screen, you’ll want to make sure the framebuffer driver loads:
# echo vesafb >> /etc/initramfs-tools/modules # echo fbcon >> /etc/initramfs-tools/modules
Now install the kernel and the headers from the created Debian packages:
# dpkg -i linux-image-126.96.36.199+drm33.5-mykernel_188.8.131.52+drm33.5-mykernel-10.00.Custom_i386.deb # dpkg -i linux-headers-184.108.40.206+drm33.5-mykernel_220.127.116.11+drm33.5-mykernel-10.00.Custom_i386.deb
Now let’s generate an initramfs (initrd) image, that will be loaded up by grub on boot:
# cd /boot
To avoid confusion with the next command, here is what my /boot directory contains before I run the mkinitramfs command:
# ls -altr total 27700 -rw-r--r-- 1 root root 160280 2010-03-23 05:37 memtest86+.bin -rw-r--r-- 1 root root 4034976 2010-08-20 14:22 vmlinuz-2.6.32-24-generic -rw-r--r-- 1 root root 1689036 2010-08-20 14:22 System.map-2.6.32-24-generic -rw-r--r-- 1 root root 115905 2010-08-20 14:22 config-2.6.32-24-generic -rw-r--r-- 1 root root 651618 2010-08-20 14:22 abi-2.6.32-24-generic -rw-r--r-- 1 root root 1196 2010-08-20 14:24 vmcoreinfo-2.6.32-24-generic drwxr-xr-x 22 root root 4096 2010-09-04 15:27 .. -rw-r--r-- 1 root root 0 2010-09-07 22:11 initrd.img-2.6.31-wl -rw-r--r-- 1 root root 7977082 2010-09-07 22:49 initrd.img-2.6.32-24-generic -rw-r--r-- 1 root root 115845 2010-09-08 02:13 config-18.104.22.168+drm33.5-mykernel -rw-r--r-- 1 root root 3999488 2010-09-08 07:38 vmlinuz-22.214.171.124+drm33.5-mykernel -rw-r--r-- 1 root root 1644782 2010-09-08 07:38 System.map-126.96.36.199+drm33.5-mykernel drwxr-xr-x 3 root root 4096 2010-09-08 16:01 .
Run the mkinitramfs to generate the initrd:
# mkinitramfs -k -o initrd.img-188.8.131.52+drm33.5-mykernel 184.108.40.206+drm33.5-mykernel
4. Configure grub to boot from the new kernel image
The last thing to do is to ensure that the ath9k module loads on boot. That will avoid running modprobe ath9k after each reboot.
So lets add the line ath9k to the end of the /etc/modules file:
# echo ath9k >> /etc/modules
Now reboot your computer and chose the new kernel to boot into from the grub menu.
Your wireless NIC should be working now using the ath9k driver.
There is a very flexible and easy Linux tool that helps you change the EXIF meta-data of images. It allows you to change individual files or whole bunch of them with one command. You can also put different rules about what files and how you want to change them if you need to.
The program is called exiftool. So let’s install it first.
In terminal execute:
sudo apt-get install libimage-exiftool-perl
Now you are ready to start changing the meta-data of the images.
For example, if I wanted to change all the dates and times (DateTimeOriginal, CreateDate and ModifyDate) of the IMG_01.jpg file to the 8th of August 2010 at 3:35:33 PM I would do:
exiftool -AllDates='2010:08:08 15:35:33' -overwrite_original IMG_01.jpg
If I wanted to change the dates on all the files in the “images” directory, I would do:
exiftool -AllDates='2010:08:08 15:35:33' -overwrite_original images
The “-overwrite_original” option is necessary if you want to change the meta-data of the original images. If you omit that option, then exiftool will back-up the originals by making a copy of them and adding “_original” to the end of the file names.
If you want to change the dates to all the files in the “images” directory that were taken by a Cannon camera (and not touch the rest) I would do:
exiftool -AllDates='2010:08:08 15:35:33' -if '$make eq "Canon"' -overwrite_original images
As far as changing dates and times, there is another option of exiftool that lets you do time calculation.
For example, the other day I found out that my camera’s time was correct but the date was ahead by 30 days. That meant that all the photos I had taken lately had dates that were off by exactly 30 days. If I were to use the above examples I could set the dates individually (which would be a long and tedious process) or set all the images to the same date and time (which would be wrong). In this case I used the date calculating option and just executed:
exiftool -AllDates-=720:00 -overwrite_original images
That command subtracts 720 hours (30 days) off the dates of each image file in the images directory. Now every image has the exact date and time it was taken.
I have only scratched the surface of what this tool is capable of. For more information look at the man pages of the exiftool command.
If you do not have Eclipse installed yet, run:
sudo apt-get install eclipse
sudo apt-get install subversion
Install the Subversion plugin for Eclipse
Get the Java bindings for Subversion:
sudo apt-get install libsvn-java
Now we are ready to install the plugins in Eclipse.
Go to Help -> Install New Software
Then hit the “Add” button.
Put “Subclipse 1.6.x (Eclipse 3.2+)” under Name and “http://subclipse.tigris.org/update_1.6.x” under Location:
The above is for Elclips 3.2+ and Subversion 1.6.x.
If you have different Eclipse or Subversion versions, check this list and substitute accordingly:
Name: Subclipse 1.6.x (Eclipse 3.2+)
Name: Subclipse 1.4.x (Eclipse 3.2+)
Name: Subclipse 1.2.x (Eclipse 3.2+)
Name: Subclipse 1.0.x (Eclipse 3.0/3.1)
More info about the different versions: http://subclipse.tigris.org/servlets/ProjectProcess?pageID=p4wYuA
Then hit “OK”. You will now be presented with these options:
If you are unsure what Subclipse component you will need, you can check all of them. Also, keep in mind that you can always go back to this in the future and install/uninstall any of the components as needed.
Then “Next” and “Finish” on the subsequent screens.
After the plugins are installed, it will prompt you to restart Eclipse. Go ahead and do so.
You are not done yet. You need to fix the JavaHL.
Edit the eclipse.ini file:
sudo vi /usr/lib/eclipse/eclipse.ini
Add the following line under -vmargs:
Edit (2012-11-23): The above path is for a 32bit installation. The 64bit installation’s library path is /usr/lib/x86_64-linux-gnu/jni. If you are unsure the JavaHL library is on your machin, just search for libsvnjavahl-1.so:
That will give you the path you need to add to the eclipse.ini file.
sudo find / -name "libsvnjavahl-1.so"
That will give you the path you need to add to the eclipse.ini file.
Here is what my eclipse.ini file looks like:
$ cat /usr/lib/eclipse/eclipse.ini -startup plugins/org.eclipse.equinox.launcher_1.0.201.R35x_v20090715.jar --launcher.library plugins/org.eclipse.equinox.launcher.gtk.linux.x86_1.0.200.v20090520 -showsplash org.eclipse.platform --launcher.XXMaxPermSize 256m -startup --launcher.library -showsplash org.eclipse.platform --launcher.XXMaxPermSize 256m -startup /usr/lib/eclipse/plugins/org.eclipse.equinox.launcher_1.0.201.R35x_v20090715.jar --launcher.library /usr/lib/eclipse/plugins/org.eclipse.equinox.launcher.gtk.linux.x86_1.0.200.v20090520 -vmargs -Djava.library.path=/usr/lib/jni -Dorg.eclipse.equinox.p2.reconciler.dropins.directory=//usr/share/eclipse/dropins -Xms40m -Xmx256m -Dorg.eclipse.equinox.p2.reconciler.dropins.directory=//usr/share/eclipse/dropins
For more info on fixing JavaHL if you need it: http://subclipse.tigris.org/wiki/JavaHL#head-bb1dd50f9ec2f0d8c32246430c00e237d27a04fe
You should be able to use Subversion with Eclipse for your projects at this point.
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