Ubuntu
update-manager package

  1. Bug #1332543
  2. Comment #7

Comment 7 for bug 1332543

Revision history for this message
Mike Miller (akf-mike-nw2) wrote :

Sorry if you use the Ctrl+alt+F key you will need to use
ctrl+alt+F7
to get back to your X Server Console.

Again it may actually be Ctrl+Alt+F7 OR Alt+F7 OR Ctrl+Alt+F8 OR Alt+F8 it just depends on what exact version you are using of Ubuntu as to how you will accomplish this.

Source:
http://askubuntu.com/questions/157617/reverting-from-ctrl-alt-f1

Sorry about not adding this to my last comment, but wanted to make sure I provided the info for how to get back to your standard X Server console :-) .

If all else fails you can issue:

sudo shutdown -r now

From any console and this will cause your system to do a proper restart right away with NO wait. Once restarted your machine should return you back to your default X Server console should you lose your way.