First live boot to your Linux Mint system, using external Live CD/USB Drive, then follow these commands to re-install GRUB on MBR.
- mount your Linux installed partition to some mount point. here XY is the number of your Linux distro partition.
sudo mount <root-partition[e.g. /dev/sdaXY]> <mount-point[e.g. /mnt/]>
- Now bind some essential live root partition directories to mounted root partition at /mnt.
sudo mount --bind /dev /mnt/dev && sudo mount --bind /dev/pts /mnt/dev/pts && sudo mount --bind /proc /mnt/proc && sudo mount --bind /sys /mnt/sys
- Now, change the root to newly mounted partition directory.
sudo chroot <mount-point[e.g. /mnt/]>
- Now, install the GRUB using grub-install command at your HDD MBR.
grub-install /dev/sda
- Finally update the grub entries to show newly detected partition operating systems.
update-grub
- And at last unmount all the binded partition directories, and then reboot.
sudo reboot
That’s it, hope this will help!!