When I run the command
sudo apt-get update
I got this warning:
There is no public key available for the following key IDs: [key_id]
To fix:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys [key_id]
The command above downloads the missing key using the hexadecimal numbers given the [key_id] with apt-key. After running apt-key to download the missing [key_id], any packages from that repositories will be considered trusted.
When I have to personalize the settings of my FreeNX client, I have to know which resolution should I set in order to get a maximized window which perfectly fit my desktop. Once I get connected to my remote desktop and having its window resized, I get the new resolution with:
xdpyinfo | grep dimensions
dimensions: 3200x1200 pixels (847x318 millimeters)
or
xrandr -q | grep current
Screen 0: minimum 8 x 8, current 3200 x 1200, maximum 8192 x 8192
Tags: "find out the screen resolution", "screen resolution", xdpyinfo, xrandr
CLI, nx no machine, Remote desktop, script, Shell, Terminal, Xfce, Xubuntu | admin | 
April 4, 2013 10:41 am | 
Comments (0)
If you are running Prelink on your Gnu/Linux distribution you could get a crash when launching Skype. To inspect the real error just launch Skype using the CLI, you might get:
Fatal: QWidget: Must construct a QApplication before a QPaintDevice
Aborted (core dumped)
or
Segmentation fault (core dumped)
It has taken me several days before realise that there was a issues with Prelink. To fix it you simply have to blacklist Skype in the Prelink configuration file.
Remove Skype
sudo apt-get purge --remove skype-bin*
sudo nano /etc/prelink.conf
Add the line
-b /usr/bin/skype
Reinstall skype
sudo apt-get install skype
Rebuild the shared libraries cache
sudo ldconfig
Tested on Xubuntu 12.04. More info on this issue here:
https://bugs.launchpad.net/ubuntu/+source/skype/+bug/1002187
Tags: crash fix, prelink, QWidget: Must construct a QApplication before a QPaintDevice Aborted (core dumped), Segmentation fault (core dumped), Skype
CLI, Linux, Shell, Skype, Ubuntu, Xubuntu | admin | January 7, 2013 9:20 pm | Comments (1)
With the latest version of Virtualbox, at this time 4.2.0, it is possible to easily modify the VDI file size with just one command.
For instance, I had to increment up to 30Gb my virtual machine with which I test Mint Mate edition:
vboxmanage modifyhd --resize 30000 linux_mint_13_x64_mate.vdi
Then you have to use a partition editor, such as Gparted or PartedMagic, to expand or move your partitions.
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