GNU/Linux upgrade from Jessie to Raspbian Stretch

upgrade2DebianStretch.sh

#!/bin/bash

#Let APT know that it's not being run interactively
DEBIAN_FRONTEND=noninteractive

#Update and upgrade
apt-get update
apt-get upgrade -y --force-yes -qq
apt-get dist-upgrade -y --force-yes -qq

#System check
dpkg -C
apt-mark showhold

#Update the package repository to Debian Stretch
sed -i 's/jessie/stretch/g' /etc/apt/sources.list

#Upgrade
apt-get update
apt-get upgrade -y --force-yes -qq
apt-get dist-upgrade -y --force-yes -qq

#Done, let's reboot
reboot