Ardupilot vs Alexbuyval-Ardupilot :Gazebo SITL installation

I am using http://ardupilot.org/dev/docs/using-rosgazebo-simulator-with-sitl.html instructions to install Gazebo SITL simulation.

The first instruction is: git clone https://github.com/alexbuyval/ardupilot. However I already I have SITL installed from http://ardupilot.org/dev/docs/setting-up-sitl-on-linux.html.

jh@jh-Lenovo-Ideapad-Z50-70:~$ git clone https://github.com/alexbuyval/ardupilot
fatal: destination path ‘ardupilot’ already exists and is not an empty directory.

Do I need to reinstall alex’s ardupilot over the previous ardupilot build ?
How is Alex’s ardupilot build https://github.com/alexbuyval/ardupilot.
different from the regular build http://ardupilot.org/dev/docs/setting-up-sitl-on-linux.html.

Also will these instructions http://ardupilot.org/dev/docs/using-rosgazebo-simulator-with-sitl.html work on ubuntu 16.04 ? The article recommends ubuntu 14.042, however documentation normally lags development. Is ubuntu 16.04 currently supported and where can I find the installation instructions for gazebo sitl on linux 16.04?

Alexbuyval branch is outdated. But you can make it works by cloning it in another directory or adding it as new remote on your current ardupilot git.

I should works on ubuntu 16.04, but it is ROS based. I don’t remember if it works with ros-kinetic…

We are currently update gazebo plugin (see : https://github.com/ArduPilot/ardupilot/pull/4837 ) It should be ready soon .

Hello, what is the current status of the gazebo plugin?