To reiterate and clarify: net-tools and ifupdown both exhibit the bug in bionic, whereas neither exhibits the bug in xenial. The bug is observed in the following package versions:
:; apt-cache policy net-tools net-tools: Installed: 1.60+git20161116.90da8a0-1ubuntu1 Candidate: 1.60+git20161116.90da8a0-1ubuntu1 Version table: *** 1.60+git20161116.90da8a0-1ubuntu1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages 100 /var/lib/dpkg/status and :; apt-cache policy ifupdown ifupdown: Installed: 0.8.17ubuntu1.1 Candidate: 0.8.17ubuntu1.1 Version table: *** 0.8.17ubuntu1.1 500 500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 100 /var/lib/dpkg/status 0.8.17ubuntu1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1828749 Title: ifconfig dummy0 : Device not found To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1828749/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs