Comment 1 for bug 112132

Oleksij Rempel (olerem) wrote :

please can you post the kernel version of feisty-installcd you used. You need to start the desktop with this cd, runt terminal and type "uname -a".

If you say your feisty livecd working, it can be new ubuntu-kernel problem.
you can try to fix your system using livecd.
start cd
open xterm
mkdir /mnt/my_sys
mount /dev/sda_your_root_partition /mnt/my_sys
chroot /mnt/my_sys /bin/bash
mount -a
apt-get update
apt-get install linux-image-2.6.20-11 -generic

after this try to boot ubuntu with older kernel.