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Last update: October 28, 2008
How to reactivate Linux loaders GRUB and LILO
Solution
GRUB
- Boot from Linux installation CD and enter rescue mode;
- Mount all partitions and change root from the temporary root to the root partition of the installed system:
- #mkdir /mnt/tmp
- #mount /dev/sdXY /mnt/tmp (/dev/sdXY is the root partition)
- #chroot /mnt/tmp
- Generate /etc/mtab:
-
#grep -v rootfs /proc/mounts > /etc/mtab
- Check if the GRUB configuration file is correct:
GRUB stores its configuration in either /boot/grub/grub.conf or /boot/grub/menu.lst depending on the distribution you are using.
- Reactivate GRUB automatically:
Run the following command:
-
#grub-install /dev/[device name]
where /dev/[device name] is the name of disk/partition where you are going to install GRUB.
For example, the following command will install GRUB to the MBR of disk /dev/sda:
- Reactivate GRUB manually in case Step 5 fails:
You will receive a prompt:
Please issue the commands (4 is the root partition in this example):
grub>root (hd0,4)
grub> setup (hd0)
You will see the output:
Checking if "/boot/grub/stage1" exists... yes
Checking if "/boot/grub/stage2" exists... yes
Checking if "/boot/grub/reiserfs_stage1_5" exists... yes
Running "embed /boot/grub/reiserfs_stage1_5 (hd0)"... 18 sectors are embedded
.
succeeded
Running "install /boot/grub/stage1 (hd0) (hd0)1+18 p (hd0,4)/boot/grub/stage2
/boot/grub/grub.conf"... succeeded
Done.
grub>
- Reboot.
LILO
- Boot from Linux installation CD and enter rescue mode;
- Mount all partitions and change root from the temporary root to the root partition of the installed system:
- #mkdir /mnt/tmp
- #mount /dev/sdXY /mnt/tmp (/dev/sdXY is the root partition)
- #chroot /mnt/tmp
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Run the following command to reactivate LILO:
More information
See also:
Operating Systems:
Linux Distribution
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