In response I removed kmod-VirtualBox, akmod-VirtualBox, and VirtualBox. Then I did a fedup --clean and reattempted fedup --network 20. This went well until the reboot. Following the reboot I select the Fedup option, but nothing really happened. I ended up back in my Fedora 19 system while running the new Fedora 20 kernel. As an update on the other machine where I was having problems with the net install. I checked for any meaningful logs but found that none exist. The /var/log directory hasn't even been created. So, then I tried to run a grub2-mkconfig, grub2-install, dracut series to potentially fix the problem. The file sizes did change a bit, but the end result was the same.