If you don’t want to use a user interface to change the effect of Ctrl+Alt+Backspace in any flavour of Ubuntu you can follow these steps:

1) Install the “dontzap” package
sudo apt-get install dontzap

2) Open Terminal or Konsole and type:
sudo dontzap –enable
sudo dontzap –disable

Where “disable” means that Ctrl+Alt+Backspace restarts the xserver while “enable” means that it won’t.

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