Quixote, you're the man! =D>=D>=D> You led the way sir, and for that I am very grateful.
Just to re-cap for anyone else who gets this problem:
The how-to at https://help.ubuntu.com/community/Gr...0Rescue%20Mode recommends the following commands:
Due to the relevant files actually being up one level in the root directory, the commands I actually had to put in to fix this (one line at a time) were:
linux /boot/vmlinuz root=/dev/sdXY ro
linux /vmlinuz root=/dev/sda1 ro