Since this is happening when the screen is locked, it may be a problem
with the Gnome Screensaver.
** Also affects: gnome-screensaver
Importance: Undecided
Status: New
** Also affects: gnome-screensaver (Ubuntu)
Importance: Undecided
Status: New
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Desktop Bugs, which is subscribed to gnome-screensaver in ubuntu.
https://bugs.launchpad.net/bugs/633494
Title:
Selecting 'Switch User' allows anyone to shutdown machine with logged on users
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