I need to reinstall Grub 2, but how?

[LGN]

Today I reinstalled my Windows partition of my PC. If you need to know, my config is like this
-Windows (formally XP MCE, now Vista Ultimate) on Partition 1
-Windows Recovery on Partition 2
Logical Partition
-Ubuntu 10.04 Lucid on Partition 3
-Ubuntu Swap

I have to reinstall GRUB because Windows wrote over the MBR.

I have a 10.04 install disc, but I do not know how to reinstall Grub2

how do I reinstall Grub2?

[drs305]

This post should help you restore your Grub installation:
How to restore the Ubuntu/XP/Vista/7 bootloader (Updated for Ubuntu 9.10)

Should work for Lucid as well for those reading this with a 10.04 install.

[LGN]

Where exactly does it say anything about GRUB2 in there

[drs305]

D'oh, sorry. Right title but apparently the answer to another post was still in memory. I've corrected the original.

[pritam_par]

This is quite long but worked for me

1. Boot to the LiveCD Desktop (Ubuntu 9.10 or later).
2. Open a terminal - Applications, Accessories, Terminal.
3. Determine your normal system partition - (the switch is a lowercase "L")

sudo fdisk -l
* If you aren't sure, run

df -Th. Look for the correct disk size and ext3 or ext4 format.
4. Mount your normal system partition:
* Substitute the correct partition: sda1, sdb5, etc.

sudo mount /dev/sdXX /mnt # Example: sudo mount /dev/sda1 /mnt
5. Only if you have a separate boot partition:
* sdYY is the /boot partition designation (for example sdb3)
*sudo mount /dev/sdYY /mnt/boot
6. Mount the critical virtual filesystems:

sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys /mnt/sys
7. To ensure that only the grub utilities from the LiveCD get executed, mount /usr

sudo mount --bind /usr/ /mnt/usr
8. Chroot into your normal system device:

sudo chroot /mnt
9. If there is no /boot/grub/grub.cfg or it's not correct, create one using

update-grub
10. Reinstall GRUB 2:
*Substitute the correct device - sda, sdb, etc. Do not specify a partition number.

grub-install /dev/sdX
11.Verify the install (use the correct device, for example sda. Do not specify a partition): sudo grub-install --recheck /dev/sdX

[Shobuz99]

Deleted post. Started new thread


Shobuz99