I’m getting a bit desperate as I have now more idea where to look.
I created a Virtualbox VM based on headless Ubuntu server with an extra (virtual) disk for nextcloud data for being more flexible when reusing that VM for some other use.
Exporting the appliance and importing it to some other server (with other network MACs and IP number using network bridge) at first seemed fine, but resulted to “You don’t have permission to upload or create files here.” for anything that is placed into /nextcloud/data (as defined in config.php).
I checked virtual hardware, logs, this forum … and came up empty. Everthing seems fine.
Any idea how to analyze/fix this problem?