This is not fixed completely.
Steps:
1. Login into the system
2. Select "Switch user"
3. At the login screen, select Options -> Shutdown.
4. Anyone can shutdown the machine.
using 9.04
** Changed in: gdm (Ubuntu)
Status: Fix Released => New
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User can shutdown machine even if others are logged in
https://bugs.launchpad.net/bugs/148534
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