Installed Nagios. Getting "Unable to get process status"

I followed instructions on a clean Ubuntu build per nagios instructions.
Did this 5 times now.
Receiving on the webpage "Unable to get process status"
Ran sudo systemctl status nagios.service and seeing nagios.service: Failed with result 'exit-code'.
Any Linux and/ord Nagios omegle shagle voojio wizards out there?
Did this 5 times now.
Receiving on the webpage "Unable to get process status"
Ran sudo systemctl status nagios.service and seeing nagios.service: Failed with result 'exit-code'.
Any Linux and/ord Nagios omegle shagle voojio wizards out there?