Well whatever problem I was having with Win 10 updates has solved itself forcibly. It crashed and I now have a newer Win 11 machine with a new drive, and fortunately most of the data from the old one salvaged, though none of the programs. It runs at least, and almost as soon as I started running it it decided it needed an update, which took a few minutes. In the next few days I'll be busy scrubbing off some of the Microcrap, and setting it up the way I like it, but I must say Win 11 is not as bad as I had feared, and it looks as if we're running both desk and lap tops in it now.
I have been getting a little more familiar with Linux in the meantime, and might yet become comfortable with the command line, but I must say that the syntax is strange, and, more importantly, the ability of people to explain the simplest and most fundamental things is crazily limited. All the instructions seem to start two steps in. I think I'm going to have to abandon attempts to do it via internet and buy a book!