This content failed to load

Just installed Nextcloud 15 on Ubuntu running apache2 php 7.2 and mysql.
the web installer ran just fine - no errors. But when I log in, I get the following error: “This content failed to load.”
Any ideas as to what it could be?

Have you tried checking the logs?

Also check if you’re getting logs in Apache.

Did a clean install of ubuntu and started over. Everything is working now. Probably not the correct way to do it, but I had all my data on an external storage so no harm done.