#!/bin/bash set -ex IS_DEBIAN_9=0 IS_UBUNTU_18_04=0 grep -q '^VERSION=.\(9 (stretch)\)' /etc/os-release && IS_DEBIAN_9=1 grep -q '^VERSION=.\(18.04.[0-9]\+ LTS\)' /etc/os-release && IS_UBUNTU_18_04=1 if [ $IS_DEBIAN_9 = 1 ]; then cat > /etc/apt/sources.list <