I’m not very comfortable with docker containers and how docker hub functions, but this specific container has been showing build error for the past weeks https://hub.docker.com/r/pschmitt/owncloud/builds/. The corresponding logs on hub.docker are empty so I don’t know what this really means (especially given that the docker seems to have been untouched for months on Github.
Could removing the image force Rockstor to re-pull the image upon the rock-on reinstall?
Of course, I noticed that @suman is apparently considering using the official docker image now so maybe that’s what you’re using…