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I found the following answer, which solves this problem:

yp7y-stu commented on 13 Dec 2020 posted:

I had taken 1 day to solve this problem. My mistake was that I didn't git under ~/catkin_ws/src. The correct build meshod is described below.

$ mkdir ~/catkin_ws $ mkdir ~/catkin_ws/src $ cd ~/catkin_ws/src $ git clone https://github.com/slamtech/rplidar_ros $ cd ~/catkin_ws $ ls -l /dev/ttyUSB0 $ sudo chmod 666 /dev/ttyUSB0 $ catkin_make rplidarNode $ source ~/catkin_ws/devel/setup.bash $ roslaunch rplidar_ros view_rplidar.launch

I found the following answer, which solves this problem:

yp7y-stu commented on 13 Dec 2020 posted:

I had taken 1 day to solve this problem. My mistake was that I didn't git under ~/catkin_ws/src. The correct build meshod is described below.

$ mkdir ~/catkin_ws $ mkdir ~/catkin_ws/src $ cd ~/catkin_ws/src $ git clone https://github.com/slamtech/rplidar_ros $ cd ~/catkin_ws $ ls -l /dev/ttyUSB0 $ sudo chmod 666 /dev/ttyUSB0 $ catkin_make rplidarNode $ source ~/catkin_ws/devel/setup.bash $ roslaunch rplidar_ros view_rplidar.launch

I found the following answer, which solves this problem:

yp7y-stu commented on 13 Dec 2020 posted:

I had taken 1 day to solve this problem. problem.

My mistake was that I didn't git under ~/catkin_ws/src. ~/catkin_ws/src.

The correct build meshod method is described below.below:

$ mkdir ~/catkin_ws $ mkdir ~/catkin_ws/src $ cd ~/catkin_ws/src $ git clone https://github.com/slamtech/rplidar_ros $ cd ~/catkin_ws $ ls -l /dev/ttyUSB0 $ sudo chmod 666 /dev/ttyUSB0 $ catkin_make rplidarNode $ source ~/catkin_ws/devel/setup.bash $ roslaunch rplidar_ros view_rplidar.launch

I found the following answer, which solves this problem:

yp7y-stu commented on 13 Dec 2020 posted:

I had taken 1 day to solve this problem.

My mistake was that I didn't git under ~/catkin_ws/src.~/catkin_ws/src.

The correct build method is described below:

$ mkdir ~/catkin_ws
$ mkdir ~/catkin_ws/src
$ cd ~/catkin_ws/src
$ git clone https://github.com/slamtech/rplidar_ros
$ cd ~/catkin_ws
$ ls -l /dev/ttyUSB0
$ sudo chmod 666 /dev/ttyUSB0
$ catkin_make rplidarNode
$ source ~/catkin_ws/devel/setup.bash
$ roslaunch rplidar_ros view_rplidar.launch
view_rplidar.launch