This forked version only tested on Ubuntu 20.04 and ROS Noetic Ninjemys
sudo apt install ros-noetic-control
sudo apt install ros-noetic-ros-control
sudo apt install ros-noetic-ros-controllers
Compile Simulation Model
cd ~
mkdir -p omx_ws/src
cd omx_ws/src
git clone https://github.com/ekorudiawan/open_manipulator_simulations.git
cd ..
catkin_make
source devel/setup.bash
Run Gazebo Simulation
roslaunch open_manipulator_gazebo open_manipulator_gazebo.launch
Run RVIZ
roslaunch open_manipulator_description open_manipulator_rviz.launch