I have a dual system of Ubuntu and Windows 7 and encountered the same problem after in place upgrade from 16.04 to 16.10. I tried boot-repair before but it didn't work. Just a moment ago I tried this command and it worked:
sudo grub-install /dev/sda -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1633839 Title: No symbol table. Press any key to continue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1633839/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs