We have a local mirror of the Ubuntu repos here at work and they are pretty fast. I couldn't figure out how to get update-manager to use them, so I upgraded my desktop machine to Hardy Heron by changing everything in
/etc/apt/sources.list from gutsy to hardy and typed
sudo aptitude update && sudo aptitude full-upgrade and let it run. It asked a couple questions about modified config files and such which I answered, and then it was done. I rebooted and it put up the pretty "UBUNTU" with the new pulsating KITT-esque progress bar...and it never went beyond that. I finally hit alt-f1 and saw that it was waiting for my input with the prompt:
resume: could not stat resume device file /dev/sda10. Please type in the name to try again or press ENTER to boot the system
I hit enter and it seemed to boot just fine. This is a pretty annoying thing to have to do every time you boot, so I searched until I found the solution for me: reinstall initramfs-tools, like so:
sudo aptitude reinstall initramfs-tools
Like Lauri Kainulainen wrote in that launchpad bug report, I've never used hibernate on this machine, so this is pretty puzzling. However, I'm continually impressed that I can find help for these obscure problems so quickly. It pays to use a popular distribution and to not be the first to try out new things with it.