How to restore Grub after installing windows in ubuntu 11.04

After installing windows grub should be restored. Following is the steps to restore Grub

Boot the system with ubuntu live cd (11.04)

Open terminal type

$ sudo gparted

Note the partition where root symbol  ”  / “   is there in mount point label field. In the above example it is present in /dev/sda6.

After that type the following command in terminal

$ sudo -i

Mount  the root partition my root is mounted in /dev/sda6. change this according to which partition your root is mounted

# mount /dev/sda6 /mnt

After mounting the root partition, install the grub using the following command

# grub-install –root-directory = /mnt  /dev/sda

If grub is installed without any errors type

# update-grub

reboot to check whether grub is restored.