Possible solution at Question #63005 [0]. Let us know if it (didn't) work.
[0] https://answers.launchpad.net/ubuntu/+source/grub/+question/63005
Possible solution at Question #63005 [0]. Let us know if it (didn't) work.
[0] https:/ /answers. launchpad. net/ubuntu/ +source/ grub/+question/ 63005