This output shows that the real bug is that there's no core snap installed:
$ snap interfaces Slot Plug - minecraft:network-bind Can you confirm that the ubuntu-core snap is installed? Can you specify which version of snappy was being used (which version of snapd package) ** Changed in: snapd (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1571675 Title: network-bind not autoconnecting the security policy To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1571675/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs