(Ogra: see the LTSP/Edubuntu question further down; Keybuk: see the
'shutdown' question).

Jouni: There two separate issues here:

  (a) displaying the [Shutdown] button
  (b) allowing the shutdown to occur

By default, the current user [physically] logged into the console is
allowed to shutdown the machine---this is the person that is sitting in
front of the screen and keyboard.

If you SSH in as another user, you should find that the
shutdown/suspend/hibernate will be prevented and permission denied.

The Edubuntu and LTSP teams specialise are particularly focused on the
type of large-deployments you're working with.

Ogra: can you confirm the how the LTSP setup overrides these types of
actions in thick-client mode?

Jouni: if you're wondering what happens, gnome-power-manager will
eventually call:

  /usr/share/hal/scripts/hal-system-power-shutdown

which in turn calls '/sbin/shutdown'.

Scott: I assume that the upstart implementation of 'shutdown' does only
execute with intent if run by capability == root?  I was hoping that
there  might be an easy PAM group called for the authorisation.

-- 
Only allow a smaller selection of users to perform privileged 
shutdown/suspend/hibernate
https://launchpad.net/bugs/81700

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