Comment 1 for bug 677244

Someone at Ubuntu though it was a good idea to to compile experimental Nouveau drivers into the kernel. That was a bad idea! Here is the pain-in-the-rear fix:
http://www.socialblogr.com/2010/10/how-to-install-nvidia-graphic-card-driver-on-ubuntu-10-10.html
Make sure you reboot between disabling Nouveau & running the installer.

Lance