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Surrounding window frame disappeared after Ubuntu release upgrade to Ubuntu 12.04 LTS so window maximize, minimize and close icons are not present anymore:

enter image description here

Note: Few months ago I switched from Unity to Gnome. Now I don't remember what exactly I installed for that, but everything was working fine.

Also, Alt+Tab and Alt+F2 don't work anymore.

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I have fixed this switching to Gnome with no effects session and changing Theme to Default.

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This happened to me when I installed the wrong graphics driver for nvidia. Make sure you have the latest (correct) driver.

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