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Hi @Rhythorn

This is specifically after cloning the turtlebot3, turtlebot3_msgs and turlebot3_simulations

For turtlebot3 installation in Noetic, try using apt instead:

$ sudo apt install ros-noetic-turtlebot3-simulations
$ sudo apt install ros-noetic-turtlebot3-msgs
$ sudo apt install ros-noetic-turtlebot3

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