In some cases this error can be safely ignored. fwupd-refresh.service just executes /usr/bin/fwupdmgr refresh command and treats exit status 2 as success (see last 2 lines of fwupd-refresh.service). But fwupdmgr can also successfully exit with status 0, which will be wrongfully interpreted by systemd as an error.

• systemctl cat fwupd-refresh:

  
  

  # /lib/systemd/system/fwupd-refresh.service
  
  [Unit]
  
  Description=Refresh fwupd metadata and update motd
  
  Documentation=man:fwupdmgr(1)
  
  After=network.target
  
  
  
  [Service]
  
  Type=oneshot
  
  CacheDirectory=fwupdmgr
  
  StandardError=null
  
  DynamicUser=yes
  
  RestrictAddressFamilies=AF_NETLINK AF_UNIX AF_INET AF_INET6
  
  SystemCallFilter=~@mount
  
  ProtectKernelModules=yes
  
  ProtectControlGroups=yes
  
  RestrictRealtime=yes
  
  SuccessExitStatus=2
  
  ExecStart=/usr/bin/fwupdmgr refresh
  
  

  
  



• sudo /usr/bin/fwupdmgr refresh:

  
  

  ...
  
  Successfully downloaded new metadata: 0 local devices supported
  
  

  
  



• echo $?: 0

  
  



• man fwupdmgr:

  
  

  EXIT STATUS
  
        Commands that successfully execute will return "0", but commands that have no actions but successfully execute will return "2".