Difference between revisions of "Grub"
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| − | = | + | GRUB is the '''gr'''ant '''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. |
| − | + | ||
| + | = configure grub = | ||
| + | To configure grub [[find out your distribution]] and proceed accordingly | ||
| + | |||
| + | == SUSE == | ||
| + | Configure the grub boot menu via /boot/grub/menu.lst or /boot/grub2/grub.cfg. | ||
| − | = | + | == Ubuntu == |
| − | + | First edit /etc/default/grub, then run sudo update-grub | |
= grub's command line = | = grub's command line = | ||
| Line 9: | Line 14: | ||
grub> initrd /boot/initrd | grub> initrd /boot/initrd | ||
grub> boot | 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 = | = backup partition table = | ||
| Line 18: | Line 37: | ||
= See also = | = See also = | ||
* [[booting from USB]] | * [[booting from USB]] | ||
| + | * https://help.ubuntu.com/community/Grub2 | ||
Latest revision as of 06:03, 15 January 2014
GRUB is the grant unified bootloader, 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.
Contents
configure grub
To configure grub find out your distribution and proceed accordingly
SUSE
Configure the grub boot menu via /boot/grub/menu.lst or /boot/grub2/grub.cfg.
Ubuntu
First edit /etc/default/grub, then run sudo update-grub
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
