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Introduzione

In questa guidà verranno illustrati vari modi per abilitare la combinazione di tasti Ctrl + Alt + Backspace molto utile per effettuare un veloce arresto di sessione.

Ubuntu «Karmic Koala» 9.10 o maggiore

In GNOME

0. Selezionare Sistema -> Preferenze -> Tastiera

0. Selezionare la scheda Disposizioni e fare clic su Opzioni disposizione

0. Fare clic su Sequenza di tasti per terminare il server X e abilitare l'opzione 'Control + Alt + Backspace

In KDE

* Launch "systemsettings"

* Select "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".

Using the command line

You can type the following command to enable Zapping immediately.

setxkbmap -option terminate:ctrl_alt_bksp

If you're happy with the new behaviour you can add that command to your ~/.xinitrc in order to make the change permanent.

Using HAL

You can add the following line in /usr/share/hal/fdi/policy/10osvendor/10-x11-input.fdi (inside the <match key="info.capabilities" contains="input.keys"> section):

<merge key="input.xkb.options" type="string">terminate:ctrl_alt_bksp</merge>

Ubuntu Jaunty 9.04

The DontZap option in the /etc/X11/xorg.conf file enables or disables the CTRL-ALT-BACKSPACE shortcut to restart the X-server. In previous Ubuntu releases, this shortcut was enabled by default, however this will change starting with 9.04 "Jaunty", as a number of users have complained about accidentally restarting their X-Server.

You can re-enable this shortcut by editing your /etc/X11/xorg.conf,

sudo nano /etc/X11/xorg.conf

then type your password, press enter, and use the simple text editor to add a ServerFlags section like this to the start, end, or middle of the file:

Section "ServerFlags"
        Option          "DontZap"               "false"
EndSection

And then restart the Computer (or log out and back in) to apply the changes. The shortcut should be re-enabled now.

If you want to disable the shortcut, either delete the section (in Jaunty) or change it to this:

Section "ServerFlags"
        Option          "DontZap"               "true"
EndSection

And then restart the Computer (or log out and back in) to apply the changes. The shortcut should be disabled now.

Aside: sticky keys

It may be worth mentioning that the Accessibility shortcuts (for both KDE and Gnome) are enabled by holding the shift-key for 8 seconds. (This is easy to do if, say, selecting multiple items with the mouse). As a result, it's easy to inadvertently enable "Sticky Keys". Now, if you press Ctrl and then release it, and a bit later, you press Alt-Bksp (the shortcut to delete a whole word), then Boom! Bye-bye X-session

Also, unlike Ctrl-Alt-Del, the Ctrl-Alt-Bksp shortcut is not trapped. It's instant death (without confirmation) for the X-server, and too bad about your unsaved files. That's why DontZap is a good default.

For anyone missing the ability to kill the X-server in emergency, may I point out Alt-SysRq-R, followed by Ctrl-Alt-F1 (the first puts the keyboard back into Raw mode, i.e. outside the control of the X-server; the latter switches Virtual Terminal.) Or you can use Alt-SysRq-K to kill the current session.

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