I can confirm this bug after upgrading from lucid to maverick.
Users with administrative rights used to be asked for their password when
shutting down the system and other users were logged in. This doesn't work
anymore.
Please note the following line in the .xsession-errors.old attached above:
gnome-session[1745]: WARNING: Unable to stop system: Authorization is required
** Package changed: gnome-panel (Ubuntu) => gnome-session (Ubuntu)
** Changed in: gnome-session (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/660120
Title:
Cannot shutdown when multiple users are logged in
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