Fedup to 18 problem

[Steve Berg]

Just tried using fedup to get a 17 system upgraded to 18.  Went through 
the fedup --network process, rebooted, let it boot to the System Upgrade 
option in grub and it seemed to start doing it's thing.  The fancy 
graphic appeared with the progress bar so I walked away.  Came back an 
hour or so later expecting to be prompted to reboot but the screen was 
the same.  Switched to the Alt-F2 terminal and saw nothing but "#" signs 
streaming to the screen.

Anyone know what causes that and how to fix?

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