I have two systems that are failing the upgrade from 3.2 to 3.3. After upgrading to the latest openHABian at the prompt and then trying to update to the latest OH release (menu item 41 in the config console).
The log says:
Adding required keys to apt... curl: (22) The requested URL returned error: 504 Gateway Time-out gpg: no valid OpenPGP data found. FAILED
Per the prompt I tried looking at the log & got this:
cd /opt/openhabian/docs/openhabian-DEBUG.md -bash: cd: /opt/openhabian/docs/openhabian-DEBUG.md: Not a directory