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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

1. Selezionare Sistema -> Preferenze -> Tastiera

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

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

In KDE

1. Selezionare Menu Kde -> Applicazioni -> Impostazioni -> Impostazioni di sistema

2. Selezionare Lingua e Paese

3. Selezionare Mappatura della tastiera

4. Nella scheda Disposizione fare clic su Abilitare mappature della tastiera

5. Selezionare la scheda Avanzate, fare clic su Sequenza di tasti per terminare il server X e abilitare Control + Alt + Backspace

Da riga di comando

Digitare da [:AmministrazioneSistema/RigaDiComando:riga di comando]:

setxkbmap -option terminate:ctrl_alt_bksp

Per abilitare questo comportamento in modo permanente, inserire il comando precendete nel file ~/.xinitrc.

Utilizzando 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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