Overview
These instructions will guide you through upgrading your TurtleBot from Diamondback to Electric
- Open a terminal window
 - Update apt repos 
sudo apt-get update
 - Install new electric packages 
sudo apt-get install ros-electric-turtlebot-robot
 - Source setup.bash 
source /opt/ros/electric/setup.bash
 Configure upstart to use electric. <wireless-id> should be something like "wlan0".
roscd turtlebot_bringup/upstart sudo ./install.bash <wireless-id>
- Edit your ~/.bashrc by replacing all instances of "diamondback" with "electric"
 - Restart your turtlebot computer for changes to take effect.
 - You may optionally remove the Diamondback install to save space. Keeping the old version of ROS around is not a problem, just be sure your paths always point to /opt/ros/electric. 
sudo apt-get remove ros-diamondback-turtlebot-robot