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0f7b58d
(Get the code!)
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.