Blank page shortly after upgrade to 16.0.1.1, but may be unrelated ... where to start debugging?

ℹ️ Support
2

Lets start with easy part.

  1. Check if you nextcloud installation is really there (it was the case when it was simply deleted like here Update to 13 fails - core/shipped.json is not available and you have to do some manual job via ssh to bring it back).

  2. Check if php is up and running. Check php Logs (seems already done).

  3. Check that your webserver is up and running. Check Web server logs also when you try to connect, e.g. for apache2 under /var/log/apache2/access.log and error.log via command tail -f /var/log/apache2/access.log and then tail -f /var/log/apache2/error.log

  4. You are using higher PHP version, check if it really works with your installation, e.g. here was mentioned some problems: Upgrade php 7.0 to 7.3 and here https://github.com/nextcloud/server/issues/11868

  5. Check if your DB is up and running.