Update:
I bit the bullet and told the installer to format /boot. That didn't help at all, and of course, now I can't boot the machine either. I'm reinstalling 9.10 and waiting another few months before trying 10.04 again.
Update:
I bit the bullet and told the installer to format /boot. That didn't help at all, and of course, now I can't boot the machine either. I'm reinstalling 9.10 and waiting another few months before trying 10.04 again.