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I installed ubuntu 12.04 and removed unity and compiz, and then I installed Gnome 3. In Gnome classic, the minimize, maximize, and close buttons are missing as well as some of the panel features.

Did this happen because I uninstalled compiz? It took up so much cpu and RAM particularly when I used flash player.

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What happens when you use the command metacity --replace. –  Uri Herrera Nov 5 '12 at 3:14
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