I just ran into the same issue on a 16.04 system in a IPv6-only network. My network configuration looks like this:
auto eno1 iface eno1 inet6 dhcp The fix posted by Graham works for me. After modifying that line I succesfully get DHCPv6 after a clean reboot. ** Changed in: ifupdown (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1543352 Title: inet6 dhcp doesn't wait for link-local address to leave tentative - dhclient fails to bind To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1543352/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs