RP-Lidar报错：Error, cannot bind to the specified serial port /dev/ttyUSB0.

Error, cannot bind to the specified serial port /dev/ttyUSB0.
[rplidarNode-2] process has died [pid 28680, exit code 255, cmd /home/lhd/ros/tergeo-indoor/install_isolated/lib/rplidar_ros/rplidarNode __name:=rplidarNode __log:=/home/lhd/.ros/log/c2ac1b12-f3df-11e8-872d-88b1110d5106/rplidarNode-2.log].
log file: /home/lhd/.ros/log/c2ac1b12-f3df-11e8-872d-88b1110d5106/rplidarNode-2*.log

sudo chmod +x /dev/ttyUSB0

sudo chmod 777 /dev/ttyUSB0

或者

sudo usermod -aG dialout lhd
or
sudo adduser $USER dialout

然后注销重新登录。
参考：https://answers.ros.org/question/199561/rplidar-driver-installation-problem-on-ubuntu/