These instructions are based on the ROS2 official installation webpage:

https://index.ros.org/doc/ros2/Installation/Dashing/Linux-Development-Setup/

There are small differences. This may change with future ROS2 updates.

• Add ROS2 apt repository (lsb_release -cs sets the repository to “sid” which is a mistake, it must be forced to “buster”)

sudo apt update && sudo apt install curl gnupg2 lsb-release
curl -s https://raw.githubusercontent.com/ros/rosdistro/master/ros.asc | sudo apt-key add -
sudo sh -c 'echo "deb [arch=amd64,arm64] http://packages.ros.org/ros2/ubuntu buster main" > /etc/apt/sources.list.d/ros2-latest.list'