This guide explains how to install ROS 2 Dashing in Raspberry Pi 3b from Ubuntu repositories via apt install. This tutorial is based in the following link: https://medium.com/realroboox/how-to-setup-ros2-on-raspberry-pi-3-model-b-6b77cd350b7a.

First, is necessary to download Ubuntu 18.04.3 for arm64(aarch64) from official site http://cdimage.ubuntu.com/releases/bionic/release/ubuntu-18.04.3-preinstalled-server-arm64+raspi3.img.xz. Is really important to use this image, because, there are alternative versions with same name and its performance in raspberry could be compromised. Also, has some issues at ROS 2 installation. But, this version has fixed all this issues.

Setup Locales

sudo locale-gen en_US en_US.UTF-8 sudo update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8 export LANG=en_US.UTF-8