Comment 2 for bug 418521

I observed something similar in my first clean install of Karmic Alpha 5. My motherboard has an nVidia chipset. Karmic evidently saw it and installed the nvidia driver line in xorg.conf, but did not install the nvidia driver. X would not start until, like above, that line was removed.

Once X was going, I could install the nvidia proprietary driver and have full graphics capability.