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the error is caused by LDS_MODEL = os.environ['LDS_MODEL'] a missing environment variable.

Try export LDS_MODEL="none"

before running

ros2 launch turtlebot3_bringup robot.launch.py

that solved it for me. (mine turtlebot3 does not have a lidar, that's why I went with "none", you might need to figure it out). Note that on Foxy there is no such variable.

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