On intrepid, Gnome no longer offers the option that a non-superuser can
shut down, only log out.
For the superuser, 'shut down' just logs you out, and takes you back to
gdm, when others are logged in. (Perhaps there should be an explanation
here). Presumably one can then force shutdown from gdm.
Thank you for taking the time to make Ubuntu better. Since what you
submitted is a Feature Request to improve Ubuntu, you are invited to
post your idea in Ubuntu Brainstorm at [WWW]
https://brainstorm.ubuntu.com/ where it can be discussed, voted by the
community and reviewed by developers. Thanks f