INSTALL/RECOVER GRUB FROM LINUX LIVE CD

Boot your Live CD/USB and open Terminal after that follow the commands: You need the root:

sudo -i

To check the drives:

sudo fdisk -l

Now select your Linux drive and change the number in following commands(Only change ' x ' with your drive number) and change (sda) with your hard drive it can be (sdb, sdc, etc) you can see this in Partition Manager:

sudo mount /dev/sda x /mnt
sudo mount /dev/sda x /mnt/boot
sudo mount --bind /dev /mnt/dev/

Now Permission command:

sudo chroot /mnt

Now grub install command and Change the 'sda' with your hard drive check in Partition Manager:

grub-install /dev/sda

Now installation finished, Enter following commands to unmount:

sudo umount /mnt/dev
sudo umount /mnt

Now Reboot your pc. That's it, Enjoy.

http://www.noobslab.com/2012/10/installrecover-grub-from-linux-live-cd.html http://www.noobslab.com/2011/10/install-grub2-from-live-cdusb-after.html