Wheeltec G60 launch报错记录：nmea_navsat_driver报错和raise OsNotDetected报错

Wheeltec G60 launch报错记录

我以为我遇到了一个问题，其实是两个问题，所以在这里记录一下。
我的系统是Ubuntu18.04 melodic

nmea_navsat_driver报错

Traceback (most recent call last):
  File "/home/zyy/LZY/catkin_ws/src/nmea_navsat_driver/scripts/nmea_serial_driver", line 35, in <module>
    import libnmea_navsat_driver.nodes.nmea_serial_driver
  File "/home/zyy/LZY/catkin_ws/src/nmea_navsat_driver/src/libnmea_navsat_driver/nodes/nmea_serial_driver.py", line 41, in <module>
    from libnmea_navsat_driver.driver import RosNMEADriver
  File "/home/zyy/LZY/catkin_ws/src/nmea_navsat_driver/src/libnmea_navsat_driver/driver.py", line 42, in <module>
    from