#!/bin/bash
sudo apt update
sudo apt upgrade
sudo sed -i 's/jessie/stretch/g' /etc/apt/sources.list
sudo apt update
sudo apt upgrade
sudo apt dist-upgrade
sudo apt autoremove
sudo apt clean
echo "now reboot ('reboot' or 'shutdown -r now')"
echo "Once rebooted run 'cat /etc/debian_version' or 'lsb_release -a'"