You have been subscribed to a public bug:
When multiple users are logged in, the system requires administrator
authorization for the system to be shut down or restarted. A non-
administrating user who is logged in can defeat this mechanism by the
following route:
1. Selecting a different user (regardless of whether that user is logged in)
from the Shut Down menu options.
2. When prompted for the password of the user selected to switch to, selecting
cancel (on 64-bit dist of Jaunty; on 32-bit, cancel is disabled at this point
and can be enabled by pressing esc, returning to the screensaver, performing an
action such as moving the mouse which returns to the password dialog, and then
selecting cancel)
3. This returns to the startup login screen, where the options menu in the
lower left of the display gives the option to shut down or restart, regardless
of the number of users logged in and regardless of administrative authorization.
** Affects: gdm (Ubuntu)
Importance: Wishlist
Status: Confirmed
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Shut Down / Restart Workaround Discovered
https://bugs.edge.launchpad.net/bugs/391811
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Bugs, which is subscribed to gdm in ubuntu.
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