F15 -> F17 upgrade "A unpack error occurred when installing the numpy package"

[David Lam]

I'm trying to upgrade my F15 system using the F17 installation DVD, but
it's failing with this error right at the start of the screen where it
starts to install/upgrade packages and has the progress bar.  I did the
verify install disk thing and it said it was fine too.

I'm not too sure what I should try next or check. Anyone get this before or
have any ideas?

I did a little reading and found preupgrade here
http://fedoraproject.org/wiki/PreUpgrade, so... maybe I'll give it a try.
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