The Ctrl-Alt-Backspace key combination which was used to restart X was disabled by default in Ubuntu 9.04. In order to re-enable this key combo, run the following command in your terminal window:
sudo aptitude install dontzap && sudo dontzap –d

Please note: I had to install the program “dontzap” prior to this command working, so I have added that to the line of code above to make life easier for you!

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