After upgrading to Ubuntu 12.10 (Quantal Quetzal) I noticed I couldn’t visit any websites.
This was because the /etc/resolv.conf had gone AWOL.
Not sure if this is normal behaviour, maybe with some clean installs it isn’t missing?
To fix it anyways I have simply made a symlink like so:
ln -s /etc/resolvconf/resolv.conf.d/original /etc/resolv.conf
/etc/resolvconf/resolv.conf/original it says:
# Generated by NetworkManager so I left the content of that file intact.