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It seems the rplidar_ros package cannot bind the /dev/ttyUSB0 port:

RPLIDAR running on ROS package rplidar_ros
SDK Version: 1.5.7
Error, cannot bind to the specified serial port /dev/ttyUSB0.

Check if you have permission to read/write serial ports (your user must be in "dialout" group), or if the sensor has been assigned to another port (e.g., /dev/ttyUSB1).

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