I had to look up "xterm" to see what that is.

So you're assuming I'm not one of those people who'd drop dead of a heart attack when confronted with a command line window.

That's okay - I wrote a book about DOS. UNIX command line = a bit more difficult, however!!!!!!! But okay.

So I imagine that I can handle the "cp" and the "/etc/apt/sources.list", but how will I know what drive letter (or whatever) my memory card is, so I can specify the target location?

And, do I need to be logged in as Administrator (I believe you call it "root") in order to access the /etc/apt directory? In which case I'll need to know how to do that too.

I guess I'll have to get out my old book "Using LINUX" which I could not manage to understand a few years ago when I tried it.