On Fri, Apr 06, 2012 at 01:31:15PM +0500, Muhammad Yousuf Khan wrote: > Thank you every one for helping me. actually i followed and read every > thing but just "grub install /dev/sdb" > alone didn't help i also run some commands in grub as well You're missing the dash between 'grub' and 'install': > grub-install /dev/sdb not > grub install /dev/sdb