Comment 5 for bug 1900668

I've seen something similar affecting my MAAS setup at home.

In my case, when I hit the grub shell, entering "normal" is enough to get grub to go back to normal and boot. I don't know if it's the same issue but if it is, I have no idea why grub wouldn't have done the right thing in the first place...

If you have access to an interactive console, it'd be interesting for you to try the "normal" trick and see if that gets you back to a booting system too, if not, then I have a different issue :)