● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
  Drop-In: /run/systemd/generator/networking.service.d
           └─50-insserv.conf-$network.conf
   Active: failed (Result: exit-code) since Mon 2017-07-03 17:45:13 EDT; 1h 36min ago
     Docs: man:interfaces(5)
 Main PID: 3739 (code=exited, status=1/FAILURE)

Jul 03 17:45:13 mainframe ifup[3739]: DHCPACK of 192.168.1.129 from 192.168.1.1
Jul 03 17:45:13 mainframe ifup[3739]: RTNETLINK answers: File exists
Jul 03 17:45:13 mainframe ifup[3739]: bound to 192.168.1.129 -- renewal in 40480 seconds.
Jul 03 17:45:13 mainframe ifup[3739]: /etc/network/if-up.d/ubuntu-fan: 29: /etc/network/if-up.d/ubuntu-fan: /usr/sbin/fanctl: not found
Jul 03 17:45:13 mainframe ifup[3739]: run-parts: /etc/network/if-up.d/ubuntu-fan exited with return code 127
Jul 03 17:45:13 mainframe ifup[3739]: Failed to bring up br0.
Jul 03 17:45:13 mainframe systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Jul 03 17:45:13 mainframe systemd[1]: Failed to start Raise network interfaces.
Jul 03 17:45:13 mainframe systemd[1]: networking.service: Unit entered failed state.
Jul 03 17:45:13 mainframe systemd[1]: networking.service: Failed with result 'exit-code'.