Comment 36 for bug 1848797

Marking this bug as higher severity doesn't address the fundamental problem that users encountering this issue have an Ubuntu install which does not know where their boot disk is. Certainly, at install time Ubuntu knew, but something has changed afterwards with the system which causes grub on upgrade to install to the wrong place - leaving the actual boot disk with an old, incompatible grub installed.

As part of the recent grub security update, we have identified several improvements that will ensure grub always successfully installs to *a* disk. But it is not possible to ensure that this is the *correct* disk.