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You're using

rosrun jet_bringup jet_real.launch

to start a launch file. rosrun expects an executable, which a launch file isn't. Take a look at the error

[rosrun] Couldn't find executable named jet_real.launch below /home/nvidia/FOLDER_FOR_ROS/catkin_ws/src/rosjet/jet_bringup

You need to use roslaunch instead

roslaunch jet_bringup jet_real.launch

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