ROS Rolling Installation in Ubuntu 20.04 – Step-by-step

Getting Started

5. 5. Setting Up Path

   Finally, to Set Up Environment Variables
   So modify the User’s Bash configuration with:

   echo "source /opt/ros/rolling/setup.bash" >> ~/.bashrc

   To Reload it simply:

   bash

6. 6. Testing ROS

   Now it’s Time to Test ROS Setup
   On a Shell Window let the Talker Publishing Messages of “Hello World!”:

   ros2 run demo_nodes_cpp talker

   

   Then Open a New One and see if the Listener is Hearing:

   ros2 run demo_nodes_py listener

   

   You should see the Talker saying that it’s Publishing messages and the Listener saying I heard those messages.
   This verifies both the C++ and Python APIs are working properly.
   Hooray!

7. 7. ROS Getting-Started Guide

   Getting-Started with ROS on Ubuntu GNU/Linux

   ROS QuickStart Tutorial

   Getting-Started with ROS on Ubuntu Tutorial.

So Now I’m truly Happy if My Guide could Help you to Quickstart with ROS in Ubuntu 20.04!