Right, I tried those code on a 3B+ bought more than 9 years ago, when I tried them on Ubuntu 24.04 just now, it was all OK. Thanks.
My guess is the OP has a 3B+ or earlier, maybe a Zero W, installed Stretch which was the latest at the time, never upgraded the OS but had kept updated with 'apt'.
Statistics: Posted by MianQi2019 — Tue Nov 04, 2025 8:54 am