I just upgraded from 19.04 to 19.10 and am also affected by this bug.
Right now trying to get the box back. The error message is indeed 'grub_file_filters not found'. This happens at the rescue prompt with 'insmod normal' as well.
I just upgraded from 19.04 to 19.10 and am also affected by this bug.
Right now trying to get the box back. The error message is indeed 'grub_file_filters not found'. This happens at the rescue prompt with 'insmod normal' as well.