1. [.launch] is neither a launch file in package

解決：export ROS_PACKAGE_PATH=￥ROS_PACKAGE_PATH:~/catkin_ws/src

2. cannot locate node [ur_driver] of package [ur_mordern_driver/ur_driver]

解決：source ~/catkin_ws/devel/setup.bash加入~/.bashrc文件中，然后在終端source ~/.bashrc

3. "roscore"尚未安裝，但實際已安裝

解決：source /opt/ros/kinetic/setup.bash加入~/.bashrc文件中，然后在終端source ~/.bashrc?

4. echo $ROS_PACKAGE_PATH查看ROS環境變量? ? ? ?

總結

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