Raspberry Pi 4 (Ubuntu 21.04) installation doesn't handle lack of /etc/rc.local

[alanbchristie]

The installation script simply looks in /etc/rc.local, but does not create it if it's not there. I eventually just installed the script manually, which was useful anyway, because there are a number of other dependencies that are not taken care of (i.e. my need for Python3 and the GPIO module).

Supporting various distributions is complex, maybe the best answer for "advanced" users is an additional section in the README that identifies the requirements/steps? A section that contains a set of 'do it yourself' notes?

If it's of any use, here are my notes...

https://gist.github.com/alanbchristie/a421cb9568ac9611436e16dee75e589b