[ubuntu-uk] no wired network after Lucid upgrade

[mac]

mac wrote:
> I've just upgraded my Dell 6400 laptop from Karmic to Lucid...
> Since the upgrade, there is no wired connection at all.

Still only have wireless, despite trying a couple of poorly-understood 
fixes I came across.  Various bug reports mention this problem, but 
don't seem to have been taken further.

Has anyone upgraded a laptop Karmic to Lucid, and got the proper default 
behaviour (detects wired connection, and uses it by default if present; 
  otherwise uses wireless)?

mac