[Bug 55576] Switch User can't use

[bstqc_ostl]

Public bug reported:

1.Choose System/Administration/Login Window/Accessibility/Enable accessible login; 
2.Choose Quit/Switch User; 
3.Appear input password  dialog box.

** Affects: gnome-session (Ubuntu)
     Importance: Untriaged
         Status: Needs Info

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Switch User can't use 
https://launchpad.net/bugs/55576