fedora 13,14,15,16,17,18 are all dead and unsupported
there really is NO way to "upgrade"
do a NEW clean install of Fedora 20
Download the fedora 20 install dvd and install that
also " preupgrade" is NOT used any more
fedora moved to a NEW program to do that called "fedup"
Last edited by John VV; 06-25-2014 at 02:34 PM.