Comment 7 for bug 551721

Revision history for this message
Rich Williamson (spam91403) wrote : Re: [grub2] grub fails to load again (in Lucid Beta1)

I had the same problem with Beta 1 and Beta 2. Please see:

https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/441941?comments=all

If you found this thread because you are stuck with an unbootable machine like I was, here is what I did to fix it:

Step 1: Restore your MBR:

## boot ubuntu live from CD/USB then do the following:

ALT-F2 gnome-terminal

sudo mount /dev/sda6 /mnt
    <- sda6 on my box. YMMV.
sudo mount --bind /dev /mnt/dev

sudo mount --bind /proc /mnt/proc

sudo mount --bind /sys /mnt/sys

sudo chroot /mnt

sudo grub-mkconfig -o /boot/grub/grub.cfg

sudo grub-install /dev/sda

 ctrl-d

sudo umount /mnt/dev

sudo umount /mnt/proc

sudo umount /mnt/sys

sudo umount /mnt

Step 2: Boot into Windows, run services.msc, and disable the "PC Angel" service.
(This was the root cause on my HP laptop, some people have suggested there are other programs which can cause this problem).

Step 3: Boot computer and repeat Step 1 since booting into Windows on Step 2 re-trashed your MBR.