ok it looks like this *might* be upstream bug 16156, which unfortunately was just very recently fixed, so backporting that to bionic may be difficult.
I'll mark the bug and take a look but even if it is possible to backport the fix, it will likely take a while. ** Changed in: systemd (Ubuntu) Status: Incomplete => Triaged ** Bug watch added: github.com/systemd/systemd/issues #16156 https://github.com/systemd/systemd/issues/16156 ** Also affects: systemd via https://github.com/systemd/systemd/issues/16156 Importance: Unknown Status: Unknown ** Also affects: systemd (Ubuntu Impish) Importance: Undecided Status: Triaged ** Also affects: systemd (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: systemd (Ubuntu Groovy) Importance: Undecided Status: New ** Also affects: systemd (Ubuntu Hirsute) Importance: Undecided Status: New ** Also affects: systemd (Ubuntu Bionic) Importance: Undecided Status: New ** Changed in: systemd (Ubuntu Bionic) Importance: Undecided => Medium ** Changed in: systemd (Ubuntu Focal) Importance: Undecided => Medium ** Changed in: systemd (Ubuntu Groovy) Importance: Undecided => Medium ** Changed in: systemd (Ubuntu Impish) Importance: Undecided => Medium ** Changed in: systemd (Ubuntu Hirsute) Importance: Undecided => Medium ** Changed in: systemd (Ubuntu Groovy) Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1928733 Title: Starting systemd Network Service fails with "Invalid argument" To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1928733/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs