Unfortunately, there's still a need to kill the XServer from time to time.
Since upgrading to Raring ctrl+alt+backspace is disabled and I can't find this option in the keyboard settings any-more:
Is there a way to re-enable it in Raring?
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I only tested this on 13.10+, but you could do the following on the terminal type:
sudo dpkg-reconfigure keyboard-configuration
This will open the keyboard configuration script. Press enter 5 times if you don't want to change any keyboard configuration and only want to kill X. When you get to the Kill X option which looks like this:
Select YES and press enter. Wait a bit while everything configures and after that you should have the ability to CTRL+ALT+BCKSPC right on the current session. After saving any work you have pending, try it yourself.
Perfect to solve any visual issues or annoying apps.