screen isn't composited

https://bugs.launchpad.net/ubuntu/+source/avant-window-navigator/+bug/359061

warning: Screen isn't composited. Please run compiz (fusion) or another compositing manager

fix:To enable the compositing manager, you need to use the "Configuration Editor", AKA gconf-editor, to set the key /apps/metacity/general/compositing_manager to true (i.e., the box must be checked). "

$ sudo apt-get install simple-ccsm compiz-fusion-plugins-extra compiz-fusion-plugins-main compiz-plugins emerald

Compiz hotkeys
Super E
Super A
Super D

Opacify