post_remove() {
    # stop outline_proxy_controller
    _proxy_service="outline_proxy_controller.service"
    _proxy_controller_exist=$(systemctl is-enabled $_proxy_service)
    echo $_proxy_controller_exist
    if [ "$_proxy_controller_exist" != "not-found" ]
    then
        systemctl stop outline_proxy_controller.service 1>/dev/null 2>&1
        systemctl disable outline_proxy_controller.service 1>/dev/null 2>&1
    fi

    # remove outline_proxy_controller
    rm --force /etc/systemd/system/outline_proxy_controller.service
    rm --force /usr/local/sbin/OutlineProxyController

    # delete outline virtual netdev
    _tun_exist=$(ip link | grep outline-tun0)
    if [ ! -z "$_tun_exist" ]
    then
        ip link delete outline-tun0 1>/dev/null 2>&1
    fi
}