I tried to upgrade from FC19 to FC20 using this procedure
yum -y update
fedup-cli --network 20

After reboot and selecting System Upgrade

I get this error message and the system stops here:

systemd[1]: Failed to initialize SELinux context ..."
systemd-cgroup-agents[533] failed to get d-bus connection: failed to connect to socket /org/freedesktop/systemd1/private: connection refused

What's wrong???
I've already spent hours trying to fix this. If I add selinux=0 enforcing=0 to the boot line, the system boots FC19.

Kind regards