I've installed Lizmap in Windows 10 but a problem is that I haven't the edition button and can't display layers from PostgreSQL. I have a "service non disponible" with "layer not valide" error in QGIS Server log when layer is added into QGIS project from PostgreSQL. Connection with PostgreSQL is working and I have authz, count... tables created in PostgreSQL after installation, but always error persist. What is the key? I installed Apache 2.41+ fcgi module, qgis-ltr 3.4 and qgis-ltr server 3.4, PostgreSQL 11 with PostGIS. Also with QGIS Server getmap url to QGIS project I have a same error "layer not valid" in Chrome.
probably You managed it already to get it work. I had a similar behavoir and my problem was, that in my QGIS-project file the athentification to the PostgreSQL-layers wasn't done in the basic way. Lizmap needs QGIS-project files where the user and passwort are stored as plain text in order to connect to the PostgreSQL database.