Comment 9 for bug 1990189

no such file as *brltty.rules" in my udev. What I did that seems to work is:

sudo systemctl stop brltty-udev.service
sudo systemctl mask brltty-udev.service
sudo systemctl stop brltty.service
sudo systemctl disable brltty.service

Not sure if this is best or even a good idea but at least it stops brltty from stealing my serial port. Since I don't use brltty it does not hurt me that brltty can't coexist with my CH340 serial port.