Comment 26 for bug 1889556

I had an amazon EC2 Ubuntu 18.04 instance fail to boot. Grub was updated to the fixed version on aug 3 (2.02-2ubuntu8.17). A fix for this bug that prevents this in the future may have been released, but the broken state the machine is in, is not recovered.

Amazon AWS is especially tricky, because you don't have a VGA console to see the error in. Even tier 1 support only has virtual console access, which is not there yet.