NetworkManager not populating resolv.conf

Use following command and answer YES to enable dynamic updates:

sudo dpkg-reconfigure resolvconf

Worked for me on Ubuntu 12.04.

I had the same problem. Seems that Ubuntu is using a local resolver now. The fastest way to remove that is to comment out the following line in /etc/NetworkManager/NetworkManager.conf:

#dns=dnsmasq

For more information, please take a look at this page.

If /etc/resolv.conf is a file then move it to /run/resolvconf/resolv.conf :

sudo mv /etc/resolv.conf /run/resolvconf/resolv.conf

Then create the symlink:

sudo ln -s ../run/resolvconf/resolv.conf /etc/resolv.conf