Tried to update f9->f10. After failing with preupdate, I got the f10 dvd.
1) Hit the bug others reported, after checking media, it would not remount. After
retrying a few times, it seems waiting long enough after closing drive it worked.
2) After choosing 'Upgrade existing /dev/md0', anaconda crashes.
https://bugzilla.redhat.com/show_bug.cgi?id=473170
3) It offers to send to result to Bugzilla. This failed also - didn't seem to get a
dhcp address (no idea why)
4) Retried again, this time sent bug report to a machine using scp. This worked.