Fix Error fwupd-refresh

Introduction 

 After installing monitoring (check_mk) I realized that the servis fwupd-refresh produces a critical error. However, this is based on a configuration mishap in the service itself. Here is the fix. 

 The service is able to perform a firmware update on UEFI machines. The service is totally useless on VMs. 

 Correction Step-by-Step 

 Edit file /lib/systemd/system/fwupd-refresh.service 

 Replace SuccessExitStatus=2 with SuccessExitStatus=1 

 Restart the service:  

 systemctl daemon-reload && sudo systemctl start fwupd-refresh.service 

 Check the service 

 systemctl status fwupd-refresh.service 

 Disable the service 

 Another possibility is to disable the service: 

 systemctl disable fwupd 

 Useful links 

 https://askubuntu.com/questions/1404691/fwupd-refresh-service-failed 

 https://askubuntu.com/questions/1227508/consequences-of-disabling-fwupd