For this and other reasons, I expect I will prefer vanilla Ubuntu over any of its derivatives on all my future installs. And the question probably does not apply to Ubuntu itself. (Yay!) Therefore, this question probably only applies to Ubuntu derivatives that have chosen to exclude the ifupdown package from their default install. It appears the package ifupdown is installed by default on Ubuntu 19.04.
(Note: As of Feb 2020, I suspect this paragraph may be incorrect and/or out of date.) This week I installed the desktop version of Ubuntu 19.04. In other words, a default install of Ubuntu (maybe 19.10?) may no longer include the ifupdown package. ( systemd-networkd may be better, but still has flaws IMO.) Finally, I am no longer confident that my update is correct. I also started configuring the network on most of my systems via systemd-networkd, rather than NetworkManager or netplan.
I also realized I may be able to solve my particular problem by reconfiguring my DHCP server to assign IP addresses based on system names, rather than MAC addresses. I never found an elegant way make NetworkManager assign a particular MAC address to the first/only Ethernet adapter on whatever system my disk happened to boot on.
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