It's probably the same issue. During an upgrade, I've got asked if I wish to continue without installing grub. Since answering No would result in broken upgrade, I've answered yes. On reboot, grub dropped to a shell. It was obvious that this was grub from 10.04 (1.98) and that upgrade never installed new grub into MBR. Installing grub with 'install-grub /dev/vda' solved the problem. Note that this is virtualized system; not sure if that changes anything.
It's probably the same issue. During an upgrade, I've got asked if I wish to continue without installing grub. Since answering No would result in broken upgrade, I've answered yes. On reboot, grub dropped to a shell. It was obvious that this was grub from 10.04 (1.98) and that upgrade never installed new grub into MBR. Installing grub with 'install-grub /dev/vda' solved the problem. Note that this is virtualized system; not sure if that changes anything.