Recover Grub2 For Ubuntu 9.10 (It is also so far successful in 10.04).
- Grub2: Download the latest version of Ubuntu Desktop edition from http://www.ubuntu.com/GetUbuntu/download and burn your Ubuntu CD.
- Grub Legacy: See the dual-boot guide about recovering grub
Reboot your computer and boot into a live session.
Mount your Ubuntu partition from Places menu. If you have multiple Ubuntu partitions (e.g., /boot, /home, /), you need to mount the /boot partition.
Are you using Grub or Grub 2?
 | Skip this section if you are sure about your version of Grub |
Go into boot/grub directory and check for the existence of the files menu.lst and grub.cfg.
- Grub Legacy uses boot/grub/menu.lst.
- Grub 2 uses uses boot/grub/grub.cfg.
If you are still not sure, view the file and check whether syntax follows Grub2 conventions.
If you downloaded Ubuntu Karmic 9.10 Live CD, but your installed version of Ubuntu uses Grub Legacy, please use this guide
Overwriting the Master Boot Record
 | Existing MBR will be lost. In order to dual-boot your computer, we will be creating a new Master Boot Record to include all operating systems, including Ubuntu Linux and Microsoft Windows. This is to be expected. |
Your Ubuntu partition is now mounted. You will need to continue Using the Terminal.
Verify if your partition is correct.
mount | tail -1
You should see output similar to this:
/dev/sda2 on /media/0d104aff-ec8c-44c8-b811-92b993823444
type ext4 (rw,nosuid,nodev,uhelper=devkit)
Note the designation for the disk /dev/sda which you will be using later, and the directory in /media.
Use Tab Completion in Terminal to complete the path. Hitting the To make sure this is indeed the Ubuntu boot partition, run
ls /media/0d104aff-ec8c-44c8-b811-92b993823444/boot
But substitute the example's UUID, 0d104aff-ec8c-44c8-b811-92b993823444, with your volume's UUID which you found earlier. If your boot partition was a separate partition which you mounted in a previous step, use this instead
ls /media/0d104aff-ec8c-44c8-b811-92b993823444
In either case, the output should be something like this:
config-2.6.18-3-686 initrd.img-2.6.18-3-686.bak System.map-2.6.18-3-686 grub lost+found vmlinuz-2.6.18-3-686 initrd.img-2.6.18-3-686 memtest86+.bin
If what you have is not similar, unmount it and try another partition.
Now that everything is mounted, we just need to reinstall GRUB by specifying the correct directory and the correct drive name:
sudo grub-install --root-directory=/media/0d104aff-ec8c-44c8-b811-92b993823444
/dev/sda
If you get BIOS warnings try:
sudo grub-install --root-directory=/media/0d104aff-ec8c-44c8-b811-92b993823444
/dev/sda --recheck
Replace /dev/sda with the location you want to install GRUB on. If all went well, you should see something like this:
Installation finished. No error reported. This is the contents of the device map
/boot/grub/device.map. Check if this is correct or not. If any of the lines is
incorrect, fix it and re-run the script `grub-install'. (hd0) /dev/sda
Reboot, making sure to boot to your hard drive and not to the live CD. Grub should be installed and both Ubuntu and Windows should have been automatically detected and listed in the menu.
The Master Boot Record will execute Grub as the initial boot-loader. The Windows boot-loader is contained within the Windows partition and will then be chainloaded by the Grub boot-loader.
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