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[spike speigel <1302852@xxxxxxxxxxxxxxxxxx>]

** Tags added: zesty

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https://bugs.launchpad.net/bugs/1302852

Title:
  Does not work in non-Unity DEs/Xsessions

Status in indicator-session package in Ubuntu:
  Confirmed

Bug description:
  Clicking any of the actions that require a prompt - shutdown, restart, etc. - in a non-Unity X session do not work. This seems to be caused by prompt selection code in https://bazaar.launchpad.net/~indicator-applet-developers/indicator-session/trunk.14.04/view/head:/src/backend-dbus/actions.c#L94 - it always assumes  that Unity prompt is available even if it, in fact, is not. 
  Checking for availability of Zenity prompt first is reported to fix this.

  For a proper solution the code responsible for detecting Unity prompt availability should be improved. Right now it seems to be simply checking if it can access D-bus. I assume the prompt is invoked via a D-bus call so I've investigated checking for name presence on the bus, but that can potentially be slow since it has a manually-set timeout. 
  Checking the XDG_CURRENT_DESKTOP variable and only showing the Unity prompt if it's set to "Unity" sounds like a better idea to me, but I'm not sure if the variable is set on Ubuntu Touch at all.

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