My work around on a gen 8 HP Microserver with OMV 4 is to
Disabling "Processor Power and Utilization Monitoring"
- Boot machine to RBSU (F9).
- Press CTRL+A.
- Select "Service Options."
- Select "Processor Power and Utilization Monitoring."
- Select "Disable."
- Press F10 to save and exit.
Install OMV 3 then upgrade to 4 with omv-release-upgrade