Owncloud not working after upgrade

I’ve been working on this system for over 3 months (time permitted) and ready to give up.

If memory serves me right, this happened right after univention-upgrade. Owncloud installation went offline and I can’t seem to do much to fix it.

There are no files stored within, so simple purge and reinstall would do the trick. Any advise greatly appreciated. Can provide logs upon request.