Fix Ctrl Alt Backspace behavior in Ubuntu
Ubuntu 9.04 disabled the semi-crucial keyboard shortcut, Ctrl+Alt+Backspace, that used to force the X graphical server to restart, and made it wonky to re-enable. Luckily, Ubuntu 9.10, due out in nine days, has a single setting to restore it.
Go to System->Preferences->Keyboard settings, then head to the Layouts tab under Keyboard settings, click the “Key sequence to kill the X server” option to expand it, then check “Control + Alt + Backspace” to set it.
Also see: Ctrl+Alt+Backspace Disabled in Most Distributions [FIX]







