Just occurred to me. Do you have the most up-to-date version of gpio (https://launchpad.net/ubuntu/+source/rpi.gpio/0.6.5-1ubuntu0.18.04.1)?
$ find /usr | grep -i gpio -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1902177 Title: Pi 4B rev 1.4 not recognized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rpi.gpio/+bug/1902177/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
