Comment 35 for bug 6550

If it is your dapper install that has this problem then you can either reinstall using the latest daily cd which fixes this problem or you can do the following:

*Boot any linux LiveCD
*bring up a terminal and mount your installed partition
mount /dev/hda3 /mnt (change hda3 to reflect your partition)
*chroot /mnt
*source /etc/profile
*apt-get update
*apt-get dist-upgrade

This will update the installed partition with the latest packages including the new build of the kernel that has EDD turned off.
Reboot and it should load fine.

Hope it helps