Get the python-catkin-tools
package from apt-get. Execute the following
command to download the ROS repositories which contain the .deb for
catkin_tools:
$ sudo sh \
-c 'echo "deb http://packages.ros.org/ros/ubuntu `lsb_release -sc` main" \
> /etc/apt/sources.list.d/ros-latest.list'
$ wget http://packages.ros.org/ros.key -O - | sudo apt-key add -
Then execute the following to install catkin_tools:
$ sudo apt-get update
$ sudo apt-get install python-catkin-tools