how to recreate boot partition in ubuntu Print

If you have a working system, you can just skip part 1 to 5.

1. Boot up a Ubuntu live-cd macthing the version you are using.

2. Mount your normal system partition. X is the drive letter. Y is the partition number:
   sudo mount /dev/sdXY /mnt

3. Only if you have a separate boot partition (where sdYY is the /boot partition designation):
   sudo mount /dev/sdYY /mnt/boot

4. Mount the critical virtual filesystems.
   for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done

5. Chroot into your normal system device:
   sudo chroot /mnt

6. Reinstall GRUB 2 (substitute the correct device with sda, sdb, etc. Do not specify a partition number):
   grub-install --recheck /dev/sdX

7. Install ubuntu kernel (Internet is required)
   apt-get install --reinstall linux-image-$(uname -r)

8. Recreate the GRUB 2 menu file (grub.cfg)
   update-grub

9. Exit chroot:
   CTRL-D on keyboard
   sudo reboot