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If you print out `ls` than you will see `disks`. You have to check which have your Linux. One by one you have to try following commands.

![code](https://i.stack.imgur.com/QwMos.png)

```
set boot=(hd0,msdosN)    #N is number is disk.
set prefix=(hd0,msdosN)/boot/grub
set root=hd0,msdosN   
insmod normal
normal
reboot
```

Then, you have to update grub loader. 

```
sudo update-grub
```

Above solution may work for you. But, if it doesn't work than try following process. You need live bootable USB for this process. Start Ubuntu, Mint, Kali or any debian-based linux than write following commands in terminal.

```
sudo mount /dev/sda5 /mnt   #/dev/sda5 is where you installed your Linux Distro
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
sudo umount /mnt/dev
sudo umount /mnt/proc
sudo umount /mnt/sys
sudo umount /mnt
```