preupgrade F16 to F17 fails with repo set-up problems

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http://forums.fedoraforum.org – I'm trying to upgrade from an up-to-date F16 to F17 using preupgrade. The preupgrade script, however, doesn't seem to download any packages. It seems to fail setting up repos. And when I did not notice this the first time, I let it reboot. It started the installation progress, but it seemed not to be doing anything (also did not report errors as well). Below is the output I see from preupgrade. Anybody has an idea how I can fix it? Thanks. preupgrade output: Loaded plugins: blacklist, fastestmirror, langpacks, whiteout No plugin match for: rpm-warm-cache No plugin match for: rem (HowTos)