Gazebo is a free 3D simulator able to show real world models of robots in complex environments. Gazebo requires a Linux environment. In these tutorials we will be using Gazebo 11 paired with ROS Noetic. You can download and see more information on Gazebo.
We will be using Ubuntu 20.04 / ROS Noetic / Python 3. For information on how to set up Ubuntu environment, and information on Linux Terminal/python 3, visit Prerequisites.
Open a terminal execute the following command to install Gazebo11
sudo apt-get install gazebo11
Open a terminal and enter
gazebo
Navigate Gazebo with the mouse using the left click, center wheel and right click.
For more instructions check out the Gazebo and the in depth installation instructions.