No internet connection after updating to Ubuntu 12.10 (Quantal Quetzal)

I encountered this problem today after running an distribution update, upgrading from 12.04 (Precise) to 12.10 (Quantal).

NetworkManager appeared to connect ok – I had an been assigned an IP address from the router etc, but still had no internet connectivity.

Running the following command fixed the problem:

sudo dpkg-reconfigure resolvconf

It is a known bug and is documented here: