You have to be running GDM in order for those buttons to appear. This requirement will go away when the next version of gnome-panel uses gnome-power-manager for shutting down.
** Changed in: gnome-panel (Ubuntu)
Importance: Untriaged => Low
Status: Unconfirmed => Confirmed
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Shut Down and Restart buttons gone--hibernate instead
https://launchpad.net/bugs/57548
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