Alt + Tab is not working in gnome shell at ubuntu 12.04 [closed]

I have installed ubuntu 12.04 and running gnome-shell. So far almost everything went fine, but Alt + Tab is not working. How can I get Alt + Tab working? or there is some other alternative?

Solution 1:

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"

Lance's graphical guide: http://i.imgur.com/8LzO2.png

Edit: My answer sucked, but it was the only one. However, Lance's comment was helpful to many, so I changed my answer for future searchers.