Recently I had a problem with the authentication in ubuntu 12.04. I managed to solve the problem by using this procedure But after successfully changing my password, I couldn't find a way to reboot my laptop. I wonder how can one reboot in that freakish environment?
The answer is right in that procedure:
reboot. If that doesn't work, hit Ctrl+Alt+Del
You can reboot via the terminal with
shutdown -r now, assuming you're root.
reboot command if you are root.