go-iotdevice amd64, arm64, armhfsudo install -d -m 0755 /etc/apt/keyrings curl -fsSL https://apt.koestler.ch/key.gpg | sudo tee /etc/apt/keyrings/koestler.gpg >/dev/null sudo tee /etc/apt/sources.list.d/koestler.sources >/dev/null <<EOF Types: deb URIs: https://apt.koestler.ch Suites: stable Components: main Signed-By: /etc/apt/keyrings/koestler.gpg EOF sudo apt update