had this after upgrading to the latest stable version.
Basically I run vncserver on my server to remotely run stuff there and after the update I only get a black screen with the mentioned error message.
I found the this topic: Systemd 240 update breaks graphical login
As mentioned there i replaced dbus with dbus-x11 and that fixed my problems.
Couldn't post on the announcement thread, hence creating this post to let you know that this issue is still around.