ADSL on eth0 not working on HP 6720s with Kubuntu 7.10 [SEC=UNCLASSIFIED]

[Lawson Hanson]

I have just installed Kubuntu 7.10 on my HP 6720s notebook PC,
    and while most things appear to work, I'm having trouble
    getting onto the internet via a hardwired ADSL modem
    connected to the eth0 (hard-wired) port

The hardware works OK on Windows Vista, so I do not think
    there is any problem there; but in Kubuntu the Network
    Manager program does not permit me to enter the URL
    of my ISP and the required user name and password, etc.

My ISP connection works fine on Kubuntu 7.04 running on
    another PC, but not on Kubuntu 7.10 running on the
    HP Compaq 6720s notebook PC

I tried running "pppoeconf", but it did not seem to be able
    to find any network connection to work with; I forget
    the exact message it displayed, but it tried "eth0"
    (the hard-wired port) and "eth1" (a wireless port)
    and failed to find anything it could use ... something
    about "access concentrator", and then just gave up,
    i.e., exited back to the command line

If anyone has any advice regarding how to get networking
    running on the HP 6720s notebook PC, I shall be
    delighted to hear from you

Best regards,

Lawson Hanson