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Did you source the workspace?

Normally, the source call is made in ~/.bashrc, but you can also just use it from the command line.

For ROS kinetic:

source /opt/ros/kinetic/setup.bash

and, in your case, assuming that your catkin workspace is actually ~/ros_workspace:

source ~/ros_workspace/devel/setup.bash

Then you should be able to do

roslaunch blink blink

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