Posting this for a friend who lives 70km away.
I installed Hardy a couple of weeks ago and all was working fine till this morning.
I was on phone talking them through wireless network problem, but in process uninstalled 'Network Manager' (NM) before installing 'wifi-radar'.
Anyhow, upshot is there is now no ethernet connection, and as such can't download any packages, nor re-install NM.
How do I get ethernet working again? (without installing Ubuntu from scratch).