Install/Recover Grub2 from Linux Live CD/USB after installation of other Operating Systems (Windows 7, 8 , 10) or Grub doesn't load

Recommended Live CD's (Ubuntu/Mint)

It is really easy to install grub.
You just have to follow simple steps after that you will see grub2 in your system again.




First of all Boot your Linux Live CD/USB then open Terminal  and enter following commands:

This command for root permissions:

Terminal Command:

sudo -i Check the drives number in Partition Manager : Terminal Command: sudo fdisk -l Now select your Linux installed 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: Terminal Commands: sudo mount /dev/sdax /mnt sudo mount /dev/sdax /mnt/boot sudo mount --bind /dev /mnt/dev/ This command will change mnt directory permissions to root permissions: Now grub install command and Change 'a' in "sda" with your hard drive where you want to install grub, check in Partition Manager: Terminal Command: grub-install /dev/sda Now installation finished, Enter following commands to unmount (If these two command doesn't work, then leave them): Terminal Commands: sudo umount /mnt/dev sudo umount /mnt Now reboot your pc: Terminal Command: sudo reboot Your grub is back. That's it.