Otherwise I did make progress with the self-employment idea. I'm hoping to set up a Moodle so I can do some private online teaching. It may be that administering my own Moodle (a VLE or LMS*) is beyond me (in which case I have some alternative ideas to explore), but today I managed to install Xampp for Linux on the laptop. I therefore have an Apache server, MySQL and PHP, though I don't yet know what I'm doing with them. :)
However, my command line skilz are returning and I'm making steady if slow progress.
* Virtual Learning Environment or (the term that is actually more accurate) a Learning Management System.