I tested 8.1 today using a fresh run through of this tutorial and it worked as expected. are you accessing http://jail_IP/owncloud?
Sigh... I am so used to just typing in the IP address and not put in the /owncloud. lol. Thanks for pointing me in the right direction. Web page did load properly.
My old set up I didn't have to do that so I will tweak the nginx.conf file to skip that part.