As stated in the Ubuntu 9.04 release notes, Ctrl-Alt-Backspace key combination to restart Xorg is disabled.
Ctrl-Alt-Backspace disabled by default in Xorg
The Ctrl-Alt-Backspace key combination to force a restart of X is now disabled by default, to eliminate the problem of accidentally triggering the key combination. Users who do want this function can enable it in their xorg.conf, or by running the command
Ubuntu Linux 9.10 Karmic Koala* System -> Preferences -> Keyboard * Select the ‘Layouts’ tab -> Click the ‘Layout Options’ button * Click the ‘Key sequence to kill the X server’ to expand it -> Check the ‘Control + Alt + Backspace’ option -> Click the ‘Close’ button
Ubuntu Linux 9.04 Jaunty Jackalope
/etc/X11/xorg.conffile and add1234Section "ServerFlags"Option "DontZap" "False"EndSection
Or simply use
If it is not installed already,12$ sudo apt-get install dontzap
dontzapcommand to enable
Ctrl+Alt+Backspace12$ sudo dontzap --disable
This acually adds
Option "DontZap" "False"
After it is done, make sure to log out & in for the change to take effect.
To enable the “DontZap” option again,12$ sudo dontzap --enable
More information about the
12 Option "DontZap" "boolean"
This disallows the use of the Ctrl+Alt+Backspace sequence. That sequence is normally used to terminate the Xorg server. When this option is enabled, that key sequence has no special meaning and is passed to clients. Default: off.