It turned out the problem here was that the VM was a Gen 1 VM, and 22.04 needs a Gen 2 VM (or at least, I could not get it to work as a Gen 1 VM).
Upgrading an existing VM from a Gen 1 to a Gen 2 isn’t possible. What you can do, however, is delete the existing VM (make sure you don’t delete it’s vhd files), and then create a new Gen 2 VM and attack the old vhd files to it. This should “upgrade” the system to a Gen 2; though apparently it is a 1 way process.
I also noted, through research, that you should disable Secure Boot on the VM; I had this off any way, but if you do have it enabled and are having difficulty, then I would suggest trying to disable it.
2.關閉Secure Boot on the VM