I tried this method too, and after an unplanned reboot, some of the upgrade started but didn't complete, and I now have an unuseable 0704 installation. Many files were replaced (the .pbackup versions are there, but passwd is one of the altered files, and even trying to boot single-user doesn't work!) and I'm honesty not sure what to do next to get this all fixed. The box boots, but doesn't do anything and isn't in a state where I can even get in and start poking around. I found the .pbackup files by using a Kubuntu live cd -- am I going to have to manually replace all of these to get back where I was?
Any ideas? Please? Since this box was the core of my network, none of my machines that were using it for DHCP are booting properly and it's just one of those failures that impacts the whole network, entertainment and otherwise.
I am downloading the amd64 DL DVD image, but it looks like it'll be at least another 24-48 hours for that to complete (why wasn't it given a torrent, by the by?)