roscd: No such package/stack 'turtlebot_navigation/'
After following the tutorial in this link click here and go all the way down to ( Running the Plugin on the Turtlebot )
when i run this command $ roscd turtlebot_navigation/
i get in error say roscd: No such package/stack 'turtlebot_navigation/'
also when i run the other command $ cd launch/includes/
i get in error say bash: cd: launch/includes/: No such file or directory
In addition, Do i have to have the turtlebot robot to run the navigation
i really appreciate your help and time