Howto Recover Grub2 After Windows Installation

There are many people who use dual booting and use two operating system together. Specially Linux and Windows. Most of the Linux user use Ubuntu. Ubuntu is very easy to use with very good interface. For dual booting with Ubuntu there is grubloader which loaded first and give you option which operating system you want to use. But some time you may destroy your grubloader. This generally happen when you repair your Windows os or reinstall the Window. In that case  You have to repair your grubloader again to get back your grubloader.


This was quite easy upto Ubuntu 9.04. Ubuntu 9.10 changed the grubloader version(grub 2). Now this become very difficult to repair grub. But you can still do it. Here is the step by step guide how to repair grub 2 when you destroy it.
You will need a LIVE cd if you are going to recover an Ubuntu Box.Download Ubuntu Jaunty, Karmic whatever you want.Open the system with Live CD (I assume you are using Ubuntu Live CD).Press Alt+F2 and enter gnome-terminal command.And continue by entering :

$sudo fdisk -l

This will show your partition table.Here is my table to understand it better :

/dev/sda1 29 8369 66999082+ 83 Linux
/dev/sda2 * 8370 13995 45190845 7 HPFS/NTFS
/dev/sda3 13996 14593 4803435 5 Extended
/dev/sda5 13996 14593 4803403+ 82 Linux swap / Solaris

Now i will mount Linux (sda1 here), i have no external boot partition as you can see.(IF YOU HAVE external one, do not forget to mount it! )

$sudo mount /dev/sda1 /mnt
$sudo mount --bind /dev /mnt/dev
$sudo mount --bind /proc /mnt/proc

The following command is optional (it copies resolv.conf)

$sudo cp /etc/resolv.conf /mnt/etc/resolv.conf

Now chroot into the enviroment we made :

sudo chroot /mnt

After chrooting, you do not need to add sudo before your commands because from now, you will run commands as root.

You may want to edit /etc/default/grub file to fit your system (timeout options etc)

#nano -w /etc/default/grub

Play with the options if you want.(But do not forget to give grub-update command if you saved it ;) )

Now install/recover Grub2 via :

#grub-install /dev/sda

command.However you may get errors with that code like me.If so please use this command :

#grub-install --recheck /dev/sda

Now you can exit the chroot, umount the system and reboot your box :

#exit
$sudo umount /mnt/dev
$sudo umount /mnt/proc
$sudo umount /mnt
$sudo reboot



Hope you will get back your grub. Enjoy dual booting. Wish you all the best.

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