@ei8fdb said in Nextcloud won't start 😞:
The one thing I could not figure out was how to make the connection between the error message
I mostly guessed from the Unknown database type polygon requested message. That pointed to some geometry related data type - http://postgis.net/ . From that I went digging into the database (from the dump file) as to who created this type. I got oc_memories_planet_geometry from that. Was quite tricky to figure because the memories app was not installed on the OPs server (but was installed sometime in the past) and this was just the remains of the app in the database.