Comment 19 for bug 477309

The solution proposed by Luiz Carlos works fine (kubuntu lucid).
The nvidia-settings's maintainer should add a dependancy to fix this bug.

Summary :

sudo aptitude update
sudo aptitude safe-upgrade
sudo aptitude install python-gtk2
sudo rm /etc/X11/xorg.conf
sudo nvidia-xconfig
sudo nvidia-settings

Cheers,
mando