preupgrade F11->F12 fails?

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http://forums.fedoraforum.org – Hi, Since F11 will EOL soon, I decided to try to upgrade to F12 using preupgrade. It runs fine and says 'upgrade will start on next boot'. However, on reboot, I get a text-mode anaconda that requests I configure eth0. Once configured it starts downloading install.img. Why is that? once preupgrade has downloaded everything why should it need to download something? Should I allow it to continue (my net is *very* slow so will take ages)? thanks for the help M. (HowTos)