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[Not an answer] Sorry if this is not in accordance with ROS ANSWERS common practices. I am ameteur.

I have encountered a similar error with turtlebot3_navigation (other packages like turtlebot3_gazebo work fine). I have run the same launch files days ago, and they worked like a charm. Currently no idea why this happens.

System setup : ubuntu 16.04 on Windows 10 and ros kinetic

Error messages:... [roslaunch.config][INFO] 2020-05-09 11:20:48,209: loading config file /opt/ros/kinetic/share/turtlebot3_navigation/launch/turtlebot3_navigation.launch [roslaunch][ERROR] 2020-05-09 11:20:48,211: Invalid roslaunch XML syntax: [Errno 13] Permission denied: '/opt/ros/kinetic/share/turtlebot3_navigation/launch/turtlebot3_navigation.launch' [roslaunch][ERROR] 2020-05-09 11:20:48,224: The traceback for the exception was written to the log file

[roslaunch][ERROR] 2020-05-09 11:20:48,229: Traceback (most recent call last): File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/__init__.py", line 306, in main p.start()

File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/parent.py", line 268, in start self._start_infrastructure()

File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/parent.py", line 217, in _start_infrastructure self._load_config()

File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/parent.py", line 132, in _load_config roslaunch_strs=self.roslaunch_strs, verbose=self.verbose)

File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/config.py", line 453, in load_config_default raise RLException(e)

RLException: Invalid roslaunch XML syntax: [Errno 13] Permission denied: '/opt/ros/kinetic/share/turtlebot3_navigation/launch/turtlebot3_navigation.launch' ...

I am trying to resolve this but unsuccessful so far.