Engine id '1' is not supported on ubuntu installation


i’m running emon now for some years. After i updated to the latest version (sorry cant remember which version it was before) most of the graphs stopped working. The emon log as well as the Apache log are telling me Engine id ‘1’ is not supported. I searched this forum and found other post on this error that all have been resolved by rewriting the SD card. As this is installed on an ubuntu 16.04.2 there is now SD card and i also would love to keep the data already in the database.

I’m running out of ideas what to check. Any hints?