● networking.service - Raise network interfaces
   Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2016-11-03 17:18:38 UTC; 2min 44s ago
     Docs: man:interfaces(5)
  Process: 3745 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
  Process: 1604 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle (code=exited, status=0/SUCCESS)
 Main PID: 3745 (code=exited, status=1/FAILURE)

Nov 03 17:18:32 MCDEBIAN ifup[3745]: No working leases in persistent database - sleeping.
Nov 03 17:18:38 MCDEBIAN ifup[3745]: can't add wlp1s0 to bridge br0: Operation not supported
Nov 03 17:18:38 MCDEBIAN ifup[3745]: can't add wlp2s0 to bridge br0: Operation not supported
Nov 03 17:18:38 MCDEBIAN ifup[3745]: Waiting for br0 to get ready (MAXWAIT is 32 seconds).
Nov 03 17:18:38 MCDEBIAN ifup[3745]: RTNETLINK answers: File exists
Nov 03 17:18:38 MCDEBIAN ifup[3745]: ifup: failed to bring up br0
Nov 03 17:18:38 MCDEBIAN systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Nov 03 17:18:38 MCDEBIAN systemd[1]: Failed to start Raise network interfaces.
Nov 03 17:18:38 MCDEBIAN systemd[1]: networking.service: Unit entered failed state.
Nov 03 17:18:38 MCDEBIAN systemd[1]: networking.service: Failed with result 'exit-code'.