After updating to version 2.6.31-20-generic, my desktop computer with an ATi HD4850 graphics card, using the fglrx driver, now won't boot to X. It goes through the boot process and displays the splash screen, but after that there is nothing on the screen. Choosing an older kernel version from GRUB doesn't make a difference.
So... How do I solve this? I don't even know how to diagnose the problem properly. I can boot into recovery mode and get to the command line, however, starting x from there only leaves me with a blank screen.
EDIT: Ok, so the source of the problem is that I had installed the catalyst driver from amd.com, which needs to be reinstalled with every kernel update. I didn't know this in advance, so now I'd like a way to revert back to fglrx from the repos. Sadly, the community docs only seem to cover the graphical way of doing this, which is kind of useless to me at the moment.
EDIT2: The ATi driver docs gave me a way to uninstall the catalyst driver using only the command line. So now I've booted back into Ubuntu and selected to install the fglrx driver from System → Hardware Drivers. However, now when I boot up, I get the message: "(EE) Unable to initialize PCS database
(EE) Missing PCS defaults file /etc/ati/amdpcsdb.default
(EE) No devices detected."
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