Dns is not updating from dhcp server ms security essentials not updating
If you do not want to use a local forwarding nameserver then configure Network Manager not to start a dnsmasq instance and not to insert that address.
In (still via resolvconf) to include the nameserver addresses Network Manager has for active connections.
For background information, please read the resolvconf documentation and Stéphane Graber's blog post.
The first method is recommended and is the easiest to deploy when working with Windows DHCP services.
But if third-party or hardware-based DHCP solutions are deployed which may or may not supported the additional options required by the Aries devices then it may be beneficial to use the integrated Lync Server DHCP services.
Second you should know that Ubuntu Desktop by default has Network Manager installed and activated.
By default Network Manager starts an instance of dnsmasq to serve as a local forwarding nameserver.