The ntopng plugin doesn't seem to be able to start. I've got it and the redis package installed. I'm running 19.7.2. I also searched the forum and didn't really find anything that seemed helpful to me. Is this a known issue?
Nevermind. I kept poking at it and eventually got it to start.
typical issue is that the DB is corrupt
in that case, you need to press the [Reset] button