preupgrade ate my F10 system

[john wendel]

Just wanted to moan and complain a little... And offer a warning, DO A 
BACKUP FIRST.

Tried to use preupgrade on an F10 box today, it was a spectacular 
failure. Got all the packages downloaded and the install started just 
fine. Then the system crashed (flashing keyboard lights, no brains left) 
while updating the selinux profiles.  After this the system wouldn't 
boot, failed to load grub with a crc error. I booted from a live cd and 
restored the /boot partition. After this the system booted, but it had a 
mix of F10 and F11 packages.

I restored the F10 system from the backup and all was fine, except it 
was F10 and not F11. Tomorrow, I'll do a real install.

John