Your config file is apparently named /etc/netplan/netplan.conf, which does not match the required "*.yaml" pattern (which is documented in the netplan(5) manpage and elsewhere).
** Changed in: netplan.io (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1761294 Title: Network configuration doesn't survive reboots after bionic dist- upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1761294/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs