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Files in /etc/network/interfaces.d ignored, but not /etc/network/interfaces itself
November 26, 2016
Edited: June 12, 2020
November 24, 2022
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Your Kernel 3.10 is too old for
systemd IFF using systemd-v230 or newer.
systemd kernel requirements in github at (github.com - systemd README) you need version >= 3.12 if you are using
systemd-v230 or newer:
REQUIREMENTS: Linux kernel >= 3.12 Linux kernel >= 4.2 for unified cgroup hierarchy support
Lines 37, 38 and 39 are printed above.
You are running under ARM architecture which I frankly know little about. Google search tells me your
armvl7 is used by Raspberry Pi and is a 32 bit kernel.
Updating your Kernel to modern times
If you want the latest (October 21, 2016) “Dirty COW” security protection (What is the "Dirty COW" bug, and how can I secure my system against it?) plus a host of other security patches, bug fixes and system improvements (after your 2013 version) you should be on kernel 4.4.0-47.
Unfortunately I don’t know how to do that for a RaspberryPi. I have linked this question to people who use RaspberryPi and have asked them to critique this answer.