Thanks a heap - I checked that out, and have downloaded the file as suggested.
For the command-line savvy user, this thread could be marked "solved" at this stage - for me, however, I'm still having some difficulty with CLI. I've got the current "build-essential whatsit, but get errors when I try to run the "make" command about failure to specify target (from memory)... I've deposited the Realtek file on my desktop, and in the terminal I think I've navigated to the desktop OK with cd / desktop, and I can see the makefile within the downloaded folder, but I've yet to get my outcome...
Any tips would be most appreciated.