This problem is present in Ubuntu 16.04 Xenial Desktop build, as well
Quick workaround:
$ rm /run/resolvconf/interface/NetworkManager
Deleting /run/resolvconf/interface/NetworkManager and re-running ifdown/ifup will result in the /etc/network/interfaces dns-nameservers to be populated into /etc/resolv.conf (aka ../run/resolvconf/resolv.conf)
This problem is present in Ubuntu 16.04 Xenial Desktop build, as well
Quick workaround:
$ rm /run/resolvconf /interface/ NetworkManager
Deleting /run/resolvconf /interface/ NetworkManager and re-running ifdown/ifup will result in the /etc/network/ interfaces dns-nameservers to be populated into /etc/resolv.conf (aka ../run/ resolvconf/ resolv. conf)