Fix grub with Fedora Live CD

Here are some more LiveCD methods that should work (just for the record). I tested the following examples using a Fedora 10 LiveCD to re-install GRUB in the master boot record of /dev/sda. Boot with the LiveCD, and open a terminal, get root privileges with su - , and then...

When the busted system is in a single ext3 root partition (say, /dev/sda5)...

mkdir /mnt/temp

mount /dev/sda5 /mnt/temp

grub-install --root-directory=/mnt/temp /dev/sda

When the busted system has separate ext3 boot and root partitions (say, /dev/sda5 and /dev/sda6)...

mkdir -p /mnt/temp/boot

mount /dev/sda5 /mnt/temp/boot

mount /dev/sda6 /mnt/temp

grub-install --root-directory=/mnt/temp /dev/sda

When the busted system has a separate ext3 boot partition (say, /dev/sda5), and the root partition is a logical volume (say, /dev/VolGroup00/LogVol00 according to lvdisplay)...

mkdir -p /mnt/temp/boot

vgchange -a y

lvdisplay

mount /dev/sda5 /mnt/temp/boot

mount /dev/VolGroup00/LogVol00 /mnt/temp

grub-install --root-directory=/mnt/temp /dev/sda

If grub-install fails with a read error or the boot loader still doesn't work, always try the GRUB shell (and vice versa). They both accomplish the same thing, but different things occur in the background. It's not necessary to mount partitions when using the GRUB shell commands in the LiveCD. Change x & y in the example to the busted system's boot partition...

/sbin/grub

grub> root (hdx,y)

grub> setup (hd0)