Because something went wrong probably and it takes unRAID literally ages to issue an update. So here’s the fix!
(until you restart the server)
SSH into unRAID and edit this file: /usr/local/emhttp/plugins/dynamix.docker.manager/include/DockerClient.php
replace this line:
preg_match('@Docker-Content-Digest:\s*(.*)@', $reply, $matches);
with this
preg_match('@Docker-Content-Digest:\s*(.*)@i', $reply, $matches);
Sauce: https://www.reddit.com/r/unRAID/comments/nk1sa2/how_to_fix_docker_update_not_available_in_unraid/
