Just to update, a clean installation test of ZM 1.34.9 on Ubuntu 18.04.4 went off without a hitch. Adding cameras and getting ZM up and running took only an evening. That test went so well that I am reluctingly abandoning the FreeNAS plugin and building a dedicated Linux server for Zoneminder. The plugin shows promise. A substantial amount of work has been done to get it to its current state. Kudos to the folks who have taken it this far. I am sure it will eventually be robust and complete. As for me, a dedicated clean installation fills the need for now.