Grub

GRUB is the grant 'u'nified 'b'ootloader, in use by most Linux distributions, e.g. Ubuntu and SUSE. You may probably want to print this page because if the bootloader is broken, there is no chance to get into the system for repair instructions, you will need to have a printout.

grub's command line

grub> kernel /boot/vmlinuz
grub> initrd /boot/initrd
grub> boot

repair grub

Boot from Knoppix,

$ mount /dev/hda3 /media/hda3
$ mount --bind /dev /media/hda3/dev
$ mount --bind /proc /media/hda3/proc
$ chroot /media/hda3
$ grub-install /dev/hda

reinstall grub

grub-install --recheck --no-floppy --root-directory=/path/to/root /dev/hda

determine entry to be booted next time

grub-reboot entry-number

backup partition table

To backup your partition table:

sfdisk -d /dev/hda > hda.pt

To restore it:

sfdisk /dev/hda < hda.pt

See also

• booting from USB