This is the snap for Ignition, a curated set of open-source libraries that encapsulate all the essentials for robotic simulation.

sudo snap install ignition-robotics --edge

(Don't have snapd installed?)

You can run the command-line ignition-robotics.ign has the Ignition CLI tool, e.g. ignition-robotics.ign gazebo empty.sdf opens the Ignition Gazebo simulator with an empty world.

You can also simply search for Ignition-robotics in the dash. It open gazebo and is equivalent to the command ignition-robotics.ign gazebo.