keyboardshortcut-keys
Ctrl+Alt+← can usually be set to restart X, however I can't find the option to allow this (it is disabled by default).
I have looked in System->Preferences->Keyboard and System->Preferences->Keyboard Shortcuts but I can't find an option to enable it.
Where can I change this setting?
Please edit the file /etc/X11/xorg.conf:
gksu gedit /etc/X11/xorg.conf
There should be a section in this file called "ServerFlags". If it's not there, add it as below at the end of the file. If it is there, make sure that the line Option "DontZap" "yes" is in there with yes as a parameter:
Section "ServerFlags"
Option "DontZap" "yes"
EndSection
You can simply add English US (or any other layout without ALTGr) to your Text Entry settings.
Then, use the standard Super + Space to use Emacs with US keybindings. Unfortunately, you won't be able to use any local characters specific to your country.
Unfortunately, you can't just reconfigure ALTGr to ALT through emacs init. Altering your xkb map would be a solution but you didn't want that. This solution is more GUI-oriented. Enjoy.
Best Answer
For Unity (13.04 to 17.04):
You want: System->Preferences->Keyboard
Then click the Layouts tab, the Options button, and expand Key sequence to kill the X server, before finally selecting the checkbox.
To enable it via the command line install dontzap
And in a terminal
To disable the shortcut: