• ROS - Ubuntu install of ROS Melodic
• ROS - Installing and Configuring Your ROS Environment

sudo apt install python-rosinstall python-rosinstall-generator python-wstool build-essential
sudo apt install ros-melodic-rosbridge-server
sudo apt install ros-melodic-tf2-web-republisher

To make robot work, add the following below line 7, in universal_robot/ur5_e_moveit_config/launch/ur5_e_moveit_planning_execution.launch

Version needed: 3.10.2