运行：

roslaunch lslidar_driver lslidar_serial.launch

完整报错内容：ERROR: cannot launch node of type [lslidar_driver/lslidar_driver_node]: Cannot locate node of type [lslidar_driver_node] in package [lslidar_driver]. Make sure file exists in package path and permission is set to executable (chmod +x)

解决方法：将雷达的launch文件和node文件的权限全部设置为“读取和写入“，并选择”允许文件作为程序执行“  

之后执行：（source后跟你的”setup.bash“文件的实际路径）

source '/home/nx/my_workspace/devel/setup.bash'

 用以更新环境变量

之后继续运行

roslaunch lslidar_driver lslidar_serial.launch

此时应该可以成功启动雷达节点，启动成功如图：