I have recently inherited a server which was not well maintained by the previous IT person and had a Nextcloud 15 installation which I wanted to upgrade. SInce the regular upgrade over Plesk failed, I decided to do a manual upgrade according to this manual https://docs.nextcloud.com/server/latest/admin_manual/maintenance/manual_upgrade.html . Unfortunately I forgot to backup the database beforehand (I backed up the entire folder). After I tried to start Nextcloud 16 (no errors during upgrade) there was no response in the Admin panel. Meaning I can still open apps and I seem to be logged in still but it is like a static page, not responding to anything.
A little bit freaked out I used Plesk to consecutively upgrade through to Nextcloud 19 (the most I could do without adding more memory to PHP which does not work for some reason) but I am still not getting any responses.
The weird thing is, that it is not showing any PHP errors (enabled ALL error reporting and display_errors on) nor is the nextcloud log giving me any clue towards the error (I have uploaded the gigantic file anyway) nextcloud
I am running PHP 7.3.27 on Ubuntu 16.04.6 LTS using Plesk Obsidian 18.0.34.
Any help is greatly appreciated, thanks!