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In order to turn system off I have to turn the power off. When I click on my user name in upper right hand corner the system shut down menu does not appear in Ubuntu 12.04. I upgraded from 11.04 to 12.04. If do click on my user name it asks me to log in and also asks if I want to shut down. When I click shut down nothing happens

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When you click your Username? You should be heading for the bottom item on the menu that appears after clicking on the little cog icon (top-right). – Lewis Goddard May 4 '12 at 19:01

Install dconf-editor. Run it at the command line by 'dconf-editor' and refer to the following figure : enter image description here

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