ubuntu 10.04 grub2

ubuntu 10.04 grub2

1.     Boot to the LiveCD Desktop (Ubuntu 9.10 or Ubuntu 10.04).

2.     Open a terminal – Applications, Accessories, Terminal.

3.     Determine your normal system partition – (the switch is a lowercase 「L」) sudo fdisk -l

o   If you aren’t sure, rundf -Th. Look for the correct disk size and ext3 or ext4 format.

4.     Mount your normal system partition:

o   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:

o   sdYY is the /boot partition designation (examply sdb3)

o   sudo mount /dev/sdYY /mnt/boot

6.     Mount devices:sudo mount --bind /dev/ /mnt/dev

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

8.     mount proc filesystemsudo mount --bind /proc/ /mnt/proc

9.     Chroot into your normal system device:sudo chroot /mnt

10.  If there is no /boot/grub/grub.cfg or it’s not correct, create one usingupdate-grub

11.  Reinstall GRUB 2:

o   Substitute the correct device – sda, sdb, etc. Do not specify a partition number.

grub-install /dev/sdX

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

13.  Exit chroot: CTRL-D on keyboard

14.  Unmount devices:sudo umount /mnt/dev

o   If you mounted a separate /boot partition:sudo umount /mnt/boot

15.  Unmount last device:sudo umount /mnt

16.  Reboot.reboot

Post-Restoration Commands

Once the user can boot to a working system, try to determine why the system failed to boot. The following commands may prove useful in locating and/or fixing the problem.

To refresh the available devices and settings in /boot/grub/grub.cfg

• sudo update-grub

To look for the bootloader location.

• grub-probe -t device /boot/grub

·        To recheck the installation. (sda, sdb, etc.) sudo grub-install --recheck /dev/sdX

·        Please check the following link for further details.