Thanks Udo, looks i should have read this first 
However, iFixedit! and actually it was easy, just needed to go like:
jarvis@JARVIS-MKII:~$ sudo mv /var/lib/openhab2/etc/org.ops4j.pax.logging.cfg /var/lib/openhab2/etc/org.ops4j.pax.logging.cfg.OLD
jarvis@JARVIS-MKII:~$ sudo cp /var/lib/openhab2/etc/org.ops4j.pax.logging.cfg.dpkg-dist /var/lib/openhab2/etc/org.ops4j.pax.logging.cfg
I’ll also post this in the linked thread in case others flunked like me…
Only backdraft is that my nice, tamed logs are getting filled up again.
But that is work for anyother day.
Best Regards,
-OLI