have lost grub been overwitten by w7 recovery

Question

accidently I chose recovery of windows in my grub menu and it promptly overwote now I dont have any boot at all. I have tried various methods with no success for example as below but when I get to sudo chroot /mnt it says unable to resolve host ubuntu.

running 11.10 x64

You'll need to install GRUB manually. To do that you'll have to boot up using a live CD then do the following:

• Setup a chroot environment.

• open a terminal and mount the root partition to /mnt

  sudo mount /dev/sdXy /mnt
  

• sdXy being the root partition of your installed ubuntu, e.g. /dev/sda5. you can find that out using

     sudo fdisk -l
  

• next, mount some virtual devices

   sudo mount --bind /dev /mnt/dev
   sudo mount --bind /proc /mnt/proc
   sudo mount --bind /sys /mnt/sys
  

• chroot into the installed system

  sudo chroot /mnt
  

• finally, (re)install GRUB

  grub-install --recheck /dev/sdX
  

• sdX is the internal hard drive, probably /dev/sda and while we're at it, we may as well update it, too.

  update-grub
  

• if there were no errors during the installation, you can type "exit" to leave chroot nd then simply reboot the computer. you should then be able to boot both windows and linux.

Answer 1

You might try using RescaTux. It is a live CD that will detect your operating systems and then install grub accordingly.

http://www.supergrubdisk.org/rescatux/