Possible Duplicate:
Desktop not showing after playing with compiz
I installed Ubuntu 11.10 Desktop on my Acer ASPIRE 5742ZG laptop, so I tried to follow the steps of this video to install Compiz ( http://www.youtube.com/watch?v=yjTP8BGjn_A ). Then I tried to use it but it doesn't work! Before installing Ubuntu 11.10 I had Ubuntu 10.04 LTS and it worked on it.