First of all find out why the Compiz plugin is not working in your system, using the wonderful script by Mr.Forlong. To get the script, visit the page-
And if even the results of the output of the script doesn’t make you understand what the problem is, then report the error, along with the output of the script at the following thread in ubuntuforums.org-
Please consider posting at the forum only as a last resort. Try some googling first.
Hope this will help you. Enjoy Your Compiz-Fusion.