Warning: upgrading Devuan jessie brings in a new version of ifupdown entangled with Systemd. Here is the message:
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ifupdown (0.8.1) unstable; urgency=medium

  The /etc/default/networking file is now read even when systemd is used,
  although its use is not recommended.

 -- Guus Sliepen <[email protected]>  Wed, 02 Dec 2015 23:25:41 +0100

ifupdown (0.8) unstable; urgency=medium

  Ifupdown now comes with a systemd service file. Any options specified in
  /etc/default/networking will no longer be used. If you are using
  CONFIGURE_INTERFACES=no, then run "systemctl disable networking" instead.
If you are using EXCLUDE_INTERFACES, then edit /etc/network/interfaces and
  remove those interfaces from any "auto" keywords.

Ifupdown will now be more strict when errors occur, and will also properly return a non-zero exit code when (de)configuring an interface fails. Please ensure your /etc/network/interfaces is correct and that your interfaces can
  be brought up and down without errors, especially during system startup.

  Ifupdown now has more fine-grained locking, allowing concurrent calls of
ifup and ifdown. It is also allowed to call ifup and ifdown from a (pre-)up
  or (post-)down line from /etc/network/interfaces, as long as no recursion
  occurs.

  You can now use the "inherits" keyword to copy settings from another
  interface stanza.

RFC 4361 DDNS support is now enabled by default for inet dhcp interfaces if
  isc-dhcp-client is installed.

 -- Guus Sliepen <[email protected]>  Sun, 22 Nov 2015 21:19:44 +0100

systemd (220-7) unstable; urgency=medium

  * The mechanism for providing stable network interface names changed.
    Previously they were kept in /etc/udev/rules.d/70-persistent-net.rules
    which mapped device MAC addresses to the (arbitrary) name they got when
    they first appeared (i. e. mostly at the time of installation). As this
had several problems and is not supported any more, this is deprecated in
    favor of the "net.ifnames" mechanism. With this most of your network
interfaces will get location-based names. If you have ifupdown, firewall,
    or other configuration that relies on the old names, you need to update
    these by Debian 10/Ubuntu 18.04 LTS, and then remove
    /etc/udev/rules.d/70-persistent-net.rules. Please see
    /usr/share/doc/udev/README.Debian.gz for details about this.

 -- Martin Pitt <[email protected]>  Mon, 15 Jun 2015 15:30:29 +0200

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The following packages interdepend with ifupdown: udev, libudev1. I had to lock the version of all three.

I was alarmed by the message but don't know if upgrading these 3 packages is really harmfull.

    Didier
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