Change dns for ubuntu 14.04

Edit resolv.conf.d/head file:
$ sudo gedit /etc/resolvconf/resolv.conf.d/head
Add your favorite  DNS address:
nameserver 8.8.8.8
nameserver 8.8.4.4

Save and reload,
$ sudo resolvconf -u

Check your changes:
$ dig something.unknown | grep SERVER

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