En anglais mais les commandes sont les mêmes :lol: :lol: :lol:
http://www.ubuntu.com/getubuntu/releasenotes/910
Since Ubuntu 9.04, 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. In addition, the Ctrl-Alt-Backspace option is now configured as an X keymap (XKB) option, replacing the X server "DontZap" option and allowing per-user configuration of this setting.
As a result, enabling or disabling the Ctrl+Alt+Backspace shortcut can now be done easily from the desktop.
Aciver Ctrl-Alt-Backspace for Ubuntu
*
Select "System"->"Preferences"->"Clavier"
*
Select the
"Agencement" tab and click on the "
Options de l'agencement" button.
* Select "
Sequence de cle pour fermer le serveur X" and selectionner
"Control + Alt + Eff Arriere".
Enabling Ctrl-Alt-Backspace for Kubuntu
* Click on the Application launcher and select "System Settings"
*
Click on "Regional & Language".
*
Select "Keyboard Layout".
*
Click on "Enable keyboard layouts" (in the Layout tab).
* Select the "Advanced" tab. Then select "Key sequence to kill the X server" and enable "Control + Alt + Backspace".
Dautres infos :
https://wiki.ubuntu.com/X/Config/DontZap
Activer les sequences de clés MagicSysRq
sudo echo 1 > /proc/sys/kernel/sysrq
http://ubuntuforums.org/showthread.php?t=617349