Installing Gazebo 11

First, check your current gazebo version, if you installed ROS with the desktop full option, you likely have gazebo9 already installed.

$ gazebo --version

If you have a version other than 11, remove it. Replace "9" with whatever version you have.

sudo apt-get remove gazebo9

Check that it has been successfully uninstalled:

gazebo --version

Option A: Install Pre-Built Debian/Ubuntu binary packages

sudo apt-get install ros-melodic-gazebo11-ros-pkgs ros-melodic-gazebo11-ros-control

Option B: Build from source

1. Setup your computer to accept software from packages.osrfoundation.org.

   sudo sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu-stable `lsb_release -cs` main" > /etc/apt/sources.list.d/gazebo-stable.list'

   You can check to see if the file was written correctly. For example, in Ubuntu Bionic (18.04), you can type:

   cat /etc/apt/sources.list.d/gazebo-stable.list

   And if everything is correct, you should see:

   deb http://packages.osrfoundation.org/gazebo/ubuntu-stable bionic main

2. Setup keys

   wget https://packages.osrfoundation.org/gazebo.key -O - | sudo apt-key add -

3. Install Gazebo.

   First update the debian database:

   sudo apt-get update

   Hint: make sure the apt-get update process ends without any errors, the console output ends in Done similar to below:

   $ sudo apt-get update
   ...
   Hit http://ppa.launchpad.net bionic/main Translation-en
   Ign http://us.archive.ubuntu.com bionic/main Translation-en_US
   Ign http://us.archive.ubuntu.com bionic/multiverse Translation-en_US
   Ign http://us.archive.ubuntu.com bionic/restricted Translation-en_US
   Ign http://us.archive.ubuntu.com bionic/universe Translation-en_US
   Reading package lists... Done

   Next install gazebo-11 by:

   sudo apt-get install libgazebo11-dev
   sudo apt-get install gazebo11

4. Check your installation

   gazebo --version

References

Gazebo and ROS Combinations

Installing gazebo_ros_pkgs

Installing Gazebo 11