Unable to install turtlebot [closed]

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Hello,

I would like to install turtlebot on my Ubuntu 14.04.3 LTS. After installing ROS, I entered the following code into the terminal:

sudo apt-get install ros-indigo-turtlebot ros-indigo-turtlebot-apps ros-indigo-turtlebot-interactions ros-indigo-turtlebot-simulator ros-indigo-kobuki-ftdi ros-indigo-rocon-remocon ros-indigo-rocon-qt-library ros-indigo-ar-track-alvar-msgs

And I get this reply:

E: package ros-indigo-turtlebot could't be found. E: package ros-indigo-turtlebot-apps could't be found. E: package ros-indigo-turtlebot-interactions could't be found. E: package ros-indigo-turtlebot-simulator could't be found. E: package ros-indigo-kobuki-ftdi could't be found. E: package ros-indigo-rocon-remocon could't be found. E: package ros-indigo-rocon-qt-library could't be found. E: package ros-indigo-ar-track-alvar-msgs could't be found.

What do I need to do to install turtlebot?

With best regards