Configure X.Org to use the new nVIDIA driver
Submethod 1 (nvidia-xconfig) [recommended]
Run the following command:
sudo apt-get install -y nvidia-glx nvidia-kernel-common
sudo nvidia-xconfig --add-argb-glx-visuals

Adding Beryl repository
Add the following repository in /etc/apt/sources.list:
deb http://ubuntu.beryl-project.org/ edgy main

oppure:
sudo echo -e "\n## Beryl repository\ndeb http://ubuntu.beryl-project.org/ edgy main" >> /etc/apt/sources.list
sudo echo && wget http://ubuntu.beryl-project.org/root@lupine.me.uk.gpg -O- | sudo apt-key add -

sudo apt-get update && sudo apt-get dist-upgrade
sudo apt-get install beryl emerald emerald-themes

heliodor