Solved the problem on my machine. Seems the problem was caused by installing 
the Keytouch application .
https://bugs.launchpad.net/ubuntu/+source/keytouch/+bug/186713
A workaround for the problem can be found here. 
http://launchpadlibrarian.net/14690735/keytouchd-launch_corrected
After a restart it works just fine.
Hope this works for you.

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shutdown/restart/logout stopped working from GUI
https://bugs.launchpad.net/bugs/220626
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