[Gllug] Installing grub from a recovery CD

[Philip Hands]

John Winters wrote:
> Hi all,
>
> I've installed Sarge on a box, followed by XP (in a partition reserved
> previously).  The XP installation has overwritten Grub's component in
> the MBR with the DOS boot loader, so I need to re-install Grub's bit,
> having booted from a CD.
>
> This is easy using lilo - just mount the partitions and do a "lilo -r",
> and I presume it must be possible with grub too but I can't find any
> clues in the grub documentation.  Can anyone give me a pointer please?

If you have Knoppix to hand, boot that, then run "sudo grub" and you'll get
a grub prompt (after a delay where it probes floppies and the like)

Then set the root device, for example if the /boot/grub directory is on
/dev/hda1 you'll want:

   grub>  root (hd0,0)

N.B.  If you have a separate /boot partition, it's that one, otherwise its
wherever the root partition is.

Regular use of the TAB key should help tell you if you're getting close.

Then assuming that you want it installed on the first drive:

   grub>  setup (hd0)

and it should give cheerful looking output.

Then reboot, and with luck, all will be well.

Cheers, Phil.
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