I recently dual-boot kali-linux-2016.2-amd64 with windows 10. After sometime I updated my windows 10 and due to this windows might have removed grub from the boot menu. Now I can't boot kali-linux from the boot menu because it doesn't appear there anymore.
So I decided to re-install grub by booting into Live-kali(Persistent) from USB. I entered the following command in the terminal:
fdisk -l sudo mount /dev/sda* /mnt sudo mount --bind /dev /mnt/dev sudo mount --bind /proc /mnt/proc sudo mount --bind /sys /mnt/sys sudo chroot /mnt grub-install /dev/sda
CTRL + D
sudo umount /mnt/dev sudo umount /mnt/proc sudo umount /mnt/sys sudo umount /mnt