6.4.2输入ros2 launch fishbot_description gazebo_sim.launch.py报错
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在本小节输入~/chapt6/chapt6_ws$ ros2 launch fishbot_description gazebo_sim.launch.py 后，终端出现报错：
zhao@zhao-VirtualBox:~/chapt6/chapt6_ws$ ros2 launch fishbot_description gazebo_sim.launch.py
[INFO] [launch]: All log files can be found below /home/zhao/.ros/log/2025-06-24-19-36-36-393800-zhao-VirtualBox-7831
[INFO] [launch]: Default logging verbosity is set to INFO
[ERROR] [launch]: Caught exception in launch (see debug for traceback): file not found: [Errno 2] No such file or directory: 'xacro'