This is a by-design issue. dhclient ensures the resolv.conf is what the associated DHCP server requested.
** Changed in: network-manager (Ubuntu) Status: Unconfirmed => Rejected -- After updating today all DNS information "falls out" of the DNS tab in network-admin. https://launchpad.net/bugs/67650 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs