This bug was fixed in the package ifupdown - 0.8.10ubuntu1.2
--------------- ifupdown (0.8.10ubuntu1.2) xenial; urgency=medium
* networking.service: exclude loopback device lo in ExecStop (LP: #1629972) This prevents the stop of networking.service from taking down the loopback 'lo' interface.
-- Scott Moser <email address hidden> Wed, 30 Nov 2016 12:23:26 -0500
This bug was fixed in the package ifupdown - 0.8.10ubuntu1.2
---------------
ifupdown (0.8.10ubuntu1.2) xenial; urgency=medium
* networking.service: exclude loopback device lo in ExecStop (LP: #1629972)
This prevents the stop of networking.service from taking down the
loopback 'lo' interface.
-- Scott Moser <email address hidden> Wed, 30 Nov 2016 12:23:26 -0500