6.0.0 install freezes, can't create /dev/null

Certainly odd. I just tried to touch /dev/null as regular user, and no complaints. I didn't turn on the extended display during my install, I may not have even noticed it, but how long did you wait after that? Maybe that error can just be ignored and in fact it was still going (usually output is sent to /dev/null when its not important) - what let you to believe it was frozen?