@Mark93 From a quick look I would say you are suffering from a recent patch that has itself now been patched in our testing channel updates:
This fixes the most recent hickup from a patch that was applied and released in the most recent testing channel updates.
You could make the changes indicated in the fix displayed in the following:
https://github.com/rockstor/rockstor-core/pull/1423/commits/a25ae2904e2172953e3367d71add63a285819956
ie change
’daemon’ back to ‘-d’.
Your installed version of this file should be located in
/opt/rockstor/src/rockstor/storageadmin/views/rockon_helpers.py
The nano editor is pre-installed.
Once that change is made and the machine rebooted, or the rockstor-service re-started:
systemctl restart rockstor
You should hopefully be up and running again.
Hope that helps.,