I think this is caused by the (insane, IMO) patch for bug #191889 here: http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/trusty/network-manager/trusty/view/head:/debian/patches/lp191889_always_offline_with_unmanaged_devices.patch
I think this is caused by the (insane, IMO) patch for bug #191889 here: http:// bazaar. launchpad. net/~ubuntu- branches/ ubuntu/ trusty/ network- manager/ trusty/ view/head: /debian/ patches/ lp191889_ always_ offline_ with_unmanaged_ devices. patch