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I always have used unity and I have never had any problem, but now that I reinstated ubuntu 12.04, but when it had stopped using her on having extinguished it I saw that unity's off button was not, it is possible to extinguish of other forms like that that I her restarted to see if it was corrected but till now I continue with the same problem, some programs that I installed were ubuntu tweak and the interior decorator of windows emerald, not if the problem is for one of these things. How can I solve it?

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Try this:

Hit Alt+Ctrl+T to open terminal and run following commands:

sudo apt-get purge indicator-session
sudo apt-get install indicator-session

And then restart you system!

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There is a bug where if you use a theme other than Ambiance or Radiance, the system status menu in the top right won't show.

I believe it is fixed if you install gnome-icon-theme-full. Log out and then log back in.

If that doesn't work, I recommend you stick with Ambiance or Radiance.

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