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I just set up a new Ubuntu 12.10 installation.

The "Unity" desktop seems to work fine, but when I switch to GNOME, all the window decorations are missing, including the borders and the resize buttons.

Has anyone seen this before? How do I fix it?

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2 Answers 2

Try running metacity --replace from the command line.

That should restore the window manager. You may not have a window manager (other then Compiz) installed.

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Are you using GNOME Classic? It's a bug of GNOME Classic, so if you are, try GNOME 3 or later version.

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GNOME Classic in Ubuntu is GNOME 3. Do you mean to use GNOME Shell? –  Eliah Kagan Jan 23 '13 at 3:08
    
Install "Gnome Shell 3.6.2" then log out. Select the Gnome (not Gnome Classic) Session from menu & log in. –  mmhyamin Jan 23 '13 at 18:43

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