it Works i had just make a update
sudo update-grub ** Changed in: grub2 (Ubuntu) Status: Incomplete => Opinion -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/768716 Title: error: symbol not found: 'grub_divmod64_full' -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs