I'm sorry, but I abandoned PureOS. There were several things that didn't work to my liking and I didn't have time to study how to do it. For the record, I've been a GNU/Linux user for years, but I didn't quite understand how to make the system work. Maybe I'm getting older... :-/
I can't help to finish this task.

Thank you @Wayne, but I don't find a solution there or something that could help me.