#!/bin/bash

# disable jessie-updates in /etc/apt/sources.list
sed -i 's/\(.*jessie\-updates\)/#\1/' /etc/apt/sources.list
# disable jessie-backports, it's deprecated
sed -i 's/\(.*jessie\-backports\)/#\1/' /etc/apt/sources.list.d/jessie-backports.list

apt-get update