I am using the alpha 2 version of 11.10 and the keyboard options there do not have an option to force a logout.

Can you tell me the keyboard shortcut so i can add it myself?

  • See askubuntu.com/questions/18641/…
    – htorque
    Jul 16, 2011 at 18:36
  • But isn't that topic about bugs? It's possible that the change to gnome 3 changed the shortcut used to kill the xserver or that i have just missed the menu that lets me choose one. Either way, the command that is executed after one presses control-alt-backspace on the current version of Ubuntu should probably work on the next one as well. That's why my question is neither about a bug, nor about an alpha release only.
    – Chriskin
    Jul 17, 2011 at 3:33

7 Answers 7


When I have this problem, I simply Ctrl + Alt + F2 into a terminal, log in, and type

killall -u  [username] gnome-session

This will basically kill all of your processes and log you out. If you want to logout all users at the same time in this manner, then you leave out the -u [username] part.

I guess you could create a new keyboard shortcut that runs this command. The only problem with this that I can forsee is if the freeze-up is because of gnome itself. Then it may not recognize the shortcut.


It seems that the latest update added an "options" menu on the keyboard preferences-->layouts that lets me activate the "control-alt-delete" shortcut like before. Or it might have always been there and i missed it.




Then run this command on Terminal: killall -u USERNAME

It worked for me.


You can open Keyboard shortcuts and create a new shortcut. Run the command killall -u yourusername gnome-session.

  • That was what i was looking for until an hour ago that i found out that the shortcut is still there - thanks though :)
    – Chriskin
    Jul 22, 2011 at 0:55

Surprised that no one mentioned sudo service lightdm restart


You can enable CtrlAltBackspace in the keyboard options this kills the x server and will probably work even if CtrlAltDelete does not.


I would imagine this is the same as 11.04 (or possibly it's just that I'm running Gnome 3), but Ctrl+Alt+Del brings up a box allowing me to logout.

  • True, but if everything is stuck there is no way for that box to appear.
    – Chriskin
    Jul 12, 2011 at 21:11

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