file 'turtlebot3 obstacle detection' was not found in the share directory of package 'turtlebot3 example'

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Hi,

I'm assuming you are trying to get the turtlebot3 repository from ROBOTIS to work. I see that there is a node called turtlebot3_obstacle_detection inside the turtlebot3_example package. First make sure you clone the correct repositories:

git clone -b dashing-devel https://github.com/ROBOTIS-GIT/turtlebot3
git clone -b dashing-devel https://github.com/ROBOTIS-GIT/turtlebot3_msgs
git clone -b dashing-devel https://github.com/ROBOTIS-GIT/turtlebot3_simulations

Once you have them cloned on your /src folder inside your workspace, compile and source your environment with

colcon build
. install/setup.bash

Once it's compiled, you can try launching the node instead of the launch file (sometimes, if a public repository indicates that is devel, then it might have things that are not working correctly yet):

ros2 run turtlebot3_example turtlebot_obstacle_detection

And that should run the node correctly. I also made this video that explains what I wrote above if you are interested:

https://www.youtube.com/watch?v=or-Bp...

Can you tell us what steps did you do? Can you explain to us more clear since we couldn't see what you did. Be sure to add details!