Thank you for the responses here and in the makergear group both people you replied to were actualy me.
I've now got it running on an identical machine (dell d620) running ubuntu 12.4, the problem machine has as you pointed out has some conflict with one of many unsupported up grades that i've installed.
the working machine is actualy connected to my M2 printer.. So I'm very happy.
one final question though, the authentification of software is it one per user?(as the seccond one runs flawlessly exsept for when I add the key code.. it hangs).
The software install was straight forward as per your instructions.