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
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