F12->F13 DVD Upgrade fails [SOLVED?]

[Patrick O'Callaghan]

[For the full story, see
https://bugzilla.redhat.com/show_bug.cgi?id=596387]

I decided to try installing via a boot.iso disk, so I created a bootable
pendrive containing boot.iso and fired it up using the "askmethod"
incantation (BTW the docmentation on how to do this is deficient; I'll
file a separate bug report on that). I then told it to use the DVD as
its repo.

At first I got exactly the same error as before, but this time I clicked
on the Edit button to see if there was anything worth changing. I looked
at the drop-down menu (it offered NFS/FTP, CD/DVD and Hard Disk if I
remember correctly). CD/DVD was selected of course, and I didn't change
it. Nor did I change the repo name field ("Installation Repository"). On
closing the Edit dialogue I then hit Retry.

The system started installing.

To repeat: I changed nothing at all (I know, they all say that, but it's
literally true), but now it worked. On previous occasions I had hit
Retry and even the Edit dialogue to no effect, but now the system
installed.

Maybe it needed time for some bus to settle, or it was the time of day,
the day of the month, the phase of the moon, whatever. Or maybe there's
a Heisenbug in Anaconda. Right now, I'll believe anything but F13 is now
installed on my system.

poc