'starting version 219' bug after the 15.04 update

I had some similar errors with my system, and I found that it was an error with some fstab entries (external drives that were no longer physically connected). I just commented them out and the system booted as usual. Or you can try to reattach missing external devices.

You may get such an error if your display manager is not sddm.

Running the following can show which display manager you are using :

cat /etc/X11/default-display-manager

For example, if your display manager is /usr/sbin/gdm, running the following may help :

sudo systemctl enable gdm.service -f