verificar compiz

http://hyanetworks.com/wordpress/2009/04/13/instalar-compiz-fusion-para-ubuntu-904-jaunty-modo-grafico/

http://www.glatelier.org/2009/01/mi-ubuntu-parte-xvii-compiz-fusion-1-instalacion-y-plugins-utiles/

instalar plugins
sudo apt-get install compiz-fusion-plugins-extra
sudo apt-get install emerald
sudo apt-get install fusion-icon