sudo apt-get update && sudo apt-get install curl apt-transport-https gnupg
    curl https://apt.hrfee.dev/hrfee.pubkey.gpg | sudo apt-key add -

    # Stable (jfa-go/jfa-go-tray only)

    echo "deb https://apt.hrfee.dev trusty main" | sudo tee /etc/apt/sources.list.d/hrfee.list

    # ------

    # Unstable (jfa-go/jfa-go-tray, waybar-mpris)

    echo "deb https://apt.hrfee.dev trusty-unstable main" | sudo tee /etc/apt/sources.list.d/hrfee.list

    # ------

    sudo apt-get update