How to get a completely clean/pristine installation of nm on Ubuntu 12.10?

[Chris Green <cl isbd net>]

I have a small server system on my LAN running Lubuntu 12.10, although
the wired network connection works OK I can't get any control of it
via Network Manager.  Network Manager is running:-

    chris@revo:~$ ps -ef | grep Network
    root      1724     1  0 16:44 ?        00:00:00 NetworkManager

but nm-tool fails (unless I become root, when it works):-

    chris@revo:~$ nm-tool

    ** (process:1988): WARNING **: Could not initialize NMClient
    /org/freedesktop/NetworkManager: Rejected send message, 2 matched rules;
    type="method_call", sender=":1.31" (uid=1000 pid=1988 comm="nm-tool ")
    interface="org.freedesktop.DBus.Properties" member="GetAll" error
    name="(unset)" requested_reply="0"
    destination="org.freedesktop.NetworkManager" (uid=0 pid=1724
    comm="NetworkManager ")

    NetworkManager Tool

    State: unknown


    ** (process:1988): WARNING **: error: could not connect to
    NetworkManager


In addition the nm-applet in the panel insists that there is no Network
Manager running and nm-connection-editor fails to connect to Network
Manager.

It seems to me that there is some sort of permissions problem somewhere
but I can't work out where at present.  Can anyone help please?

-- 
Chris Green