This must be a cockpit error, however:
I installed the latest AMD 64 iso, openmediavault_3.0.58-amd64.iso. I updated the install with the lastest patches, etc., and upgraded to the latest version, 3.0.70
To complete the install and enable the extra REPO's, I looked Under System, Plugins, Section:Utilities, for OMVExtras. (openmediavault-omvextrasorg 3.x.x) It's not there. (And note that it wasn't there in version 3.0.58 either.) I've reinstalled OMV from scratch with the ISO mentioned, (openmediavault_3.0.58-amd64.iso), with the same result.
I have a working R-PI build (OMV 3.0.68) which has openmediavault-omvextrasorg 3.4.25 under System, Plugins, Section:Utilities and it's installed.
So, did I miss something in a NOOB sort of way?
Any suggestions or even speculation on what might have went wrong would be appreciated.