On another installation today, couldn't find the Zigate (Python-based) plugin in the Add Hardware pulldown I looked at /var/log/daemon.log domoticz[55195]: Status: EventSystem - Python: Failed dynamic library load, install the latest libpython3.x library that is available for your platform. Resolved by $ sudo apt install libpython3-dev which installed libpython3.5-dev. A -dev package probably shouldn't be a runtime dependency though, is it needed for plugins, or can this be satisfied in another way?