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test_usera member of just therootgroup on the host-side in the post above, it was actually a member of thegpiogroup, however there isn't agpiogroup inside the Ubuntu Docker container; I guess I need to do someudevrules magic, a la unix.stackexchange.com/questions/42122/…?SUBSYSTEM=="gpio", GROUP="gpio", MODE="0660"rule./systo uselibgpiod- in case that is the reason you are importing it into the docker container.