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"
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.
To shutdown your system using an AutoKey script here's what you need to do.