How to get back the ALT +TAB functionality? [duplicate]

NOTE: You must use the normal Classic Session if you want to use compiz's functions

To fix this:

Firstly, install ccsm if you haven't already using

sudo apt-get install compizconfig-settings-manager compiz-plugins

and type in ccsm in the terminal

You'll get this window

Scroll down and select the checkmark on the left of "Application Switcher":