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I have a problem somewhat similar to the one in this question..

I am on Ubuntu 16.04 LTS and I usually install system updates when they are available. Yesterday I noticed that when I click on shutdown, the computer shows Logout and Lock dialog just before loging out AUTOMATICALLY instead of shutting down. I have to run shutdown command on the terminal to really shut down my computer. The above link did not help me. Hope you can understand me and solve my problem.

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Nuwan Thisara
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    How about this command : `qdbus com.canonical.Unity /com/canonical/Unity/Session com.canonical.Unity.Session.Shutdown ` Does it log you out or shutdown ? This is supposed to be the same call that gets executed from the session indicator – Sergiy Kolodyazhnyy Jul 21 '16 at 23:50
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    I've been having this same issue since last update, maybe it's some sort of new bug. I know that "me too" comments are not welcome here, but by knowing that this is affecting many people we should feel encouraged to file a bug report. The question is... wich package is producing this? – Nano Jul 22 '16 at 04:04
  • @Serg I get this -------- Error: org.freedesktop.DBus.Error.UnknownMethod No such interface 'com.canonical.Unity.Session' on object at path /com/canonical/Unity/Session – Nuwan Thisara Jul 23 '16 at 14:26
  • Finally I found the solution, this is a bug and see it [here](https://bugs.launchpad.net/cairo-dock-core/+bug/1242112). I have installed Plank and that was the interrupter, and when I delayed the start of it problem fixed. I did not put this as an answer because I found answers [here](http://askubuntu.com/questions/451791/problems-with-shutdown-and-logout-after-upgrading-to-14-04),[here](http://askubuntu.com/questions/621732/shutdown-button-only-logs-out-ubuntu-15-04) – Nuwan Thisara Jul 23 '16 at 18:52
  • I still don't know why this happened :( – Nuwan Thisara Aug 03 '16 at 10:54
  • I had a similar problem after manually installing [retropie]((https://retropie.org.uk/)) on 16.04. There was nothing of importance on the system so I just reinstalled and updated to 16.04.5. I'm not into gaming enough to dig deeper into this. – Elder Geek Sep 06 '18 at 17:05

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