Are the disks changing in any way? Is this a Dell system? A Lenovo system? This has the earmarks of a firmware issue, where the BootEntry variables are lost -- the system will then try to boot straight to disk, fail to find a valid boot image, and be stuck; all this possibly because it manages to remove BootEntry variables but not add them.
** Changed in: grub2 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1748008 Title: System does not boot after grub upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1748008/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs