Upgrade from 16.0.8 to 16.0.9 failed

Using the web update feature, after a long wait on the “Downloading” heading, I get an error message :
Downloading
Parsing response failed. <!DOCTYPE HTML PUBLIC “-//IETF//DTD HTML 2.0//EN”><html><head> <title>504 Gateway Timeout</title> </head><body> <h1>Gateway Timeout</h1> <p>The gateway did not receive a timely response from the upstream server or application.</p> <hr> <address>Apache/2.4.29 (Ubuntu) Server at xxxx.yyyy.com Port 40001</address> </body></html>

I have no idea what is wrong. Would appreciate any suggestions.

Perhaps you can wait a few days and then it works. Minimize CPU-usage and bandwith for other software.

Perhaps you can use the manual upgrade. Not tested.

https://docs.nextcloud.com/server/16/admin_manual/maintenance/manual_upgrade.html
https://docs.nextcloud.com/server/16/admin_manual/maintenance/upgrade.html

Thanks for the suggestions. For info, no other apps were running on the server, and there was no network traffic (other than the download).
Will try the manual upgrade.