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I am using Ubuntu 11.10 beta 1. The "power cog" (the button at the top right corner of the screen) seems to have disappeared. I am not sure what caused that because it was there when I installed 11.10 beta 1. So I do not quite remember. The main thing is that I suspect the problem is either gnome-session or cairo dock. Can you help me to get that button back? And when on 22nd this month beta 2 gets out and I use apt-get dist-upgrade, will it install that button once again? Thanks for your help. If you cannot help me, just tell me how to logout (not shutdown) using cairo.

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    Is the package installed? sudo apt-get install indicator-session – sergio91pt Sep 18 '11 at 16:22
  • No.Should I install it?And will installing it require me to delete cairo dock? – Aleksandar Sep 18 '11 at 16:23
  • If its not installed, probably some package removed it. Run the command and see what packages, if any, are gonna be removed for the indicator to install and then decide.. – sergio91pt Sep 18 '11 at 16:30
  • @sergio91pt If the above solved the problem, then it should probably be posted as an answer so the OP can accept it. – Christopher Kyle Horton Sep 18 '11 at 20:22
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It is called a beta for something. This has happened to me as well several times (11.10 beta 1).

You could search on Launchpad if this bug has already been reported (it'd surprise me if it hasn't been reported yet), and if it hasn't been reported yet, you could report it yourself. To logout, reboot, shutdown, ... you can just press the power button of your computer and it will ask you what it should do. The system settings can be reached using the Unity Dash.

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Is the package installed? sudo apt-get install indicator-session

If its not installed, probably some package removed it. Run the command and see what packages, if any, are gonna be removed for the indicator to install and then decide.

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