To restart Ubuntu 12.04 you now have to open a terminal (ctrl+alt+t), type "sudo shutdown -r 0" , followed by your password. I have been trying to write a script in Autokey to do this automatically, but can't manage to bring up the terminal window: keyboard.send_keys("++t") doesn't seem to work, so presumably an instruction to open gnome-terminal is needed. If anyone has a quick answer to this I would be very grateful - otherwise I'll try to learn some Debian coding..... Thanks in advance, Kaspin"
To shutdown your system using an AutoKey script here's what you need to do.
If you're open to an easier suggestion not using AutoKey, you can go to System -> Preferences -> Keyboard Shortcuts.
From there click "Add".
Now name it "Shutdown" or something, and use "gksu shutdown -r 0" as the command.
Now click the "Shortcut" cell for its row, and press you're desired key combination.
NOTE: I am running Ubuntu 11.04 but this should be applicable.