Since I haven’t put a lot of work into this yet, I am thinking about trying a clean install…
Well dang… just all of a sudden, I am now seeing messages in the All Messages stream. I didn’t do anything, honest. All I had to do was make a new Ubuntu installer and all of a sudden: messages! I am not going to mess with a new stream just now. I am going to let it run as-is all night and see if it is still working in the morning. If so, I will create a new stream and see what happens.