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The catkin_make program is not in a directory that is on the PATH by default.
Only after having run source /opt/ros/kinetic/setup.bash will the environment in which you source that file be updated to be able to find catkin_make. You need to do this in every terminal.
You may have had the source line add the end of your $HOME/.bashrc (to avoid having to execute it in every terminal) and it got changed. I would suggest to check that you have that line there.
Suddenly something happened to my Ubuntu operating system
"something" is a bit vague: did you install any updates? Ran any forced commands with apt?
Make sure you still have ros-kinetic-catkin installed.
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