Did you upgrade to Karmic before disabling restricted or 3rd party drivers?
Well friends, if you (like me) went ahead and upgraded to Karmic but failed to disable any restricted or 3rd party drivers, you may encounter problems.
I have a home-built PC that has an nvidia GeForce 5500 AGP video card, and I use the restricted nvidia drivers. I forgot to disable them before I upgraded. I had downloaded the Alternate Installation ISO via bittorrent, so I was all prepared to skip the network install headaches.
The install went fine, but when I rebooted, my screen was flashing so violently that I could not even log in. The GUI logon screen wasn't even presented. Things were so whacky, my system wasn't even fully booting, so I couldn't SSH to it from another machine!
How I fixed this
Luckily, I had a bootable Knoppix CD. I was able to boot into Knoppix, mount my Karmic system's HDD as read/write, and go into etc/X11/xorg.conf and change the driver from nvidia to nv (the one that comes with Ubuntu). Once I did that, I was able to boot into Karmic with no problems.
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