How to install tvheadend in raspbian

install-tvheadend.sh

#!/bin/bash

set -e

if [[ $EUID -ne 0 ]]; then
  echo "This script must be run as root" 1>&2
  exit 1
fi

apt-get -y install coreutils wget apt-transport-https lsb-release ca-certificates

wget -qO- https://doozer.io/keys/tvheadend/tvheadend/pgp | sudo apt-key add -
echo "deb https://apt.tvheadend.org/stable raspbian-stretch main" > /etc/apt/sources.list.d/tvheadend.list

apt-get update
apt-get -y install tvheadend