Comment 3 for bug 65962

A workaround is suggested by user radwis in thread
http://ubuntuforums.org/showthread.php?t=276642

Add the boot option acpi=force to the kernel line
in /boot/grub/menu.lst. It works for me. Here's
my Edgy boot clause:

title Kubuntu Edgy 6.10, kernel 2.6.17-10-generic
root (hd0,2)
kernel /vmlinuz root=/dev/hda3 ro acpi=force
initrd /initrd.img
boot