i got it working here https://askubuntu.com/questions/1413209/rtl-test-fails-because-of-udev-i-think-on-a-raspberry-pi-4?noredirect=1#comment2456665_1413209
i got it working here https:/ /askubuntu. com/questions/ 1413209/ rtl-test- fails-because- of-udev- i-think- on-a-raspberry- pi-4?noredirect =1#comment24566 65_1413209