ubuntu 12.04 gnome-shell Tab+Alt 无法使用的解决办法

1. Search the Ubuntu Software Center for "CompizConfig" or
   sudo apt-get install compizconfig-settings-manager
2. Launch CompizConfig Settings Manager by pressing Alt+F2 and running ccsm. (This may also be run from a Terminal.)
3. Click "Window Management"
4. Enable either "Application Switcher" or "Static Application Switcher"

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