I split this topic off since the old issue was solved (so yours has to be different). You didn’t give many details, I found two topics on the bug tracker:
Hm, not sure, they might be both related. I am using Nextcloud inside a docker container. The distribution is Univention UCS (I think it is based on Ubuntu 18.04) and it is pretty much GUI based…
What details would you need? The Nextcloud GUI is only giving me a red “!” (Computer says no).