So from the troubleshooting and testing I just did, it seems like (at
least) I had to do the following:

# To disable cloud-init's network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}

and

mv /etc/netplan/50-cloud-init.yaml /etc/netplan/50-cloud-
init.yaml.disabled

Before taking these two steps, I kept getting a DHCP address on my
interface.  After doing this and rebooting, I finally have an interface
that is simply "UP" - as configured in my /etc/network/interfaces:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

auto ens160
iface ens160 inet manual

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https://bugs.launchpad.net/bugs/1771236

Title:
  forced use of systemd-networkd interferes with ifupdown in 18.04

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