I would argue the current behavior is both mysterious and vexatious.
Ubuntu tells you nothing and refuses to do what you told it to do.

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https://bugs.launchpad.net/bugs/861171

Title:
  Shutdown from greeter does nothing when multiple accounts open

Status in The Session Menu:
  Triaged
Status in LightDM GTK+ Greeter:
  Triaged
Status in OEM Priority Project:
  In Progress
Status in OEM Priority Project precise series:
  In Progress
Status in Unity Greeter:
  Triaged
Status in “gnome-session” package in Ubuntu:
  Confirmed
Status in “indicator-session” package in Ubuntu:
  Triaged
Status in “policykit” package in Ubuntu:
  Confirmed
Status in “unity-greeter” package in Ubuntu:
  Triaged

Bug description:
  Selecting shutdown from the greeter does nothing when multiple
  accounts are open.

  This is because the lightdm user (which the greeter runs as) does not
  have permission to shutdown while sessions are open.  Inside a normal
  session this would just return you to the login screen.

  The solution is either for the indicator to say "not allowed" or to
  run a PolicyKit frontend in the greeter than can get the required
  permissions to perform the shutdown.

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