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[T Aubrey <908923@xxxxxxxxxxxxxxxxxx>]

Similar problem here.

On Ubuntu 11.10

Shutdown will not work from lightDM or from desktop if another user is
logged into the same machine.  Only the last logged in user can shutdown
from their desktop.  This is true on multiple machines for me.  Older
versions of Ubuntu allowed shutdown by any admin user on input of
password.

Workaround 1 - create a launcher that runs "sudo shutdown -P now"
running in a terminal (password required).  Note "-P" is necessary or
machine will hang before powering off.

Workaround 2 - switch to tty2 (ctrl-alt-F2), log in and run the "sudo
shutdown -P now" command manually.

-- 
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Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/908923

Title:
  Restart/Shutdown actions do not work

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  This concerns lightdm 1.0.6-0ubuntu1.2 in Ubuntu Oneiric.

  I am using LightDM as part of a stock Xubuntu install. The "Restart"
  and "Shutdown" actions from the icon at the top-right corner do
  nothing. (I have not tested "Suspend" and "Hibernate".)

  No useful information appears to be present in
  /var/log/lightdm/{lightdm.log,x-0-greeter.log}.

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