I assume you followed the instructions for setting up your ROS environment tutorial. You need to download the teleop_twist_keyboard from the github to your ~/catkin_ws/src folder.
Steps:
1) cd ~/catkin_ws/src
2) git clone https://github.com/ros-teleop/teleop_twist_keyboard
3) cd ~/catkin_ws
4) catkin_make
5) source ~/catkin_ws/devel/setup.bash
6) source ~/.bashrc
I also assume you have your ros environment in your bashrc file. It should contain the following lines :
source /opt/ros/indigo/setup.bash and you should add the following lines to your bashrc script by running :
gedit ~/.bashrc
and add :
source ~/catkin_ws/devel/setup.bash
New terminals will pick up when you open it. Also, you will need to remap linear and angular velocity for your robot to the /cmd_vel topic to use the keyboard for teleoperation. I would suggest looking into turtlebot_teleop package for details.
please specify ROS distro you are using. Did you install the package inside your ros workspace and then sourced the setup.bash properly? Check again. you should run $ source ~/your_ros_worskpace/devel/setup.bash after you run the catkin_make command to source properly.
indigo ros and idont know how sourced the setup.bash