[#54433726] Correct resolv.conf symlink for Lucid

The resolvconf package on Ubuntu Lucid defaults to a `resolv.conf` symlink
target of `/etc/resolvconf/run/resolv.conf`. Not least because it doesn't
have a `/run` dir/mount.

I'm pretty sure this is true of the 11.* releases too. Though I'm not able
to test.