[PROBLEM] Argon One case with 'power' button - config script fails to install

[Dave400]

Morning, I've recently acquired one of the Argon One raspberry pi cases from Argon 40, neat bit of kit that provides a power button in a high quality case.

They provide a script to install to enable the power button functionality and also fan speed control, and whilst I did have to manually install curl in order to run the script, it fails with

Terminal

E: Unable to locate package raspi-gpio

The script I'm running is

Terminal

curl https://download.argon40.com/argon1.sh | bash

Any ideas?