Thank you for informing us, this is a known issue and current progress on it can be followed here:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/82335 -- Networkmanager 0.6.4 "no network connection" https://launchpad.net/bugs/85512 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs