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usermod: group 'gpio' does not exist


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Hi team,


I am trying to get a voltage drop (3.3V to about 0V) detected on a GPIO pin on my OrangePi Zero running Armbian buster 20.02.1 with Linux 5.4.31-sunxi.
I have another OrangePi Zero on which I have already managed to install I2C OLED screen, and the i2cdetect was working, and so on...
For this one, I got a problem with the gpio group not existing.

As I tried to install OPi.GPIO, I got

 usermod: group 'gpio' does not exist

It's an Armbian version that I downloaded yesterday, and upgraded today with armbian-config.
So... What did I do the wrong way?


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