What is the legacy software in question? Why does it have pre-up / post-up scripts and what do they do?
Can the functionality be replicated using networkd-dispatcher which is available out of the box on bionic? Specifically the routable.d/ off.d/ directories. See http://manpages.ubuntu.com/manpages/bionic/en/man8 /networkd-dispatcher.8.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1771236 Title: forced use of systemd-networkd interferes with ifupdown in 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1771236/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
