On Fri, Jul 13, 2018 at 11:29:42AM -0500, Kent West wrote:
> westk@westkent:~$ cat /etc/network/interfaces
> > # This file describes the network interfaces available on your system
> > # and how to activate them. For more information, see interfaces(5).
> > source /etc/network/interfaces.d/*
> > # The loopback network interface
> > auto lo
> > iface lo inet loopback
Well, if the interface isn't being configured in /e/n/i then either it's
using NetworkManager or it's using systemd-networkd. Or something that
you set up by hand.