Marcel van Leeuwen wrote:

One thing that crossed my mind is that maybe there are some corrupt files on a mirror when you did you first install. Now with your second install you pulled in from a different mirror solving the problem but I'm just a guessing...

I had actually thought about that too, so just for fun, I just used the same install media (same USB drive, didn't recreate it), as the first time, for my second install. So that blew that theory up, I honestly have no idea what changed!