Alt+Ctrl+Backspace is disabled by default in Karmic, to enable it back, it’s quite easy
1. GNOME
- Goto System->Preferences->Keyboard
- Choose Layout tab, then click “Layout Options” button
- Select “Key sequence to kill the X server”and tick the option Alt+Ctrl+Backspace
2. KDE
- From your terminal, launch “systemsettings”
- Select “Regional & Language” -> “Keyboard Layout”
- In “Layout” tab, click on “Enable keyboard layouts”
- Choose “Advanced” tab, select “Key sequence to kill the X server” and tick on “Control + Alt + Backspace”
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very useful! i was looking for this..!