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Please check:

• Did you install sudo apt-get install ros-melodic-universal-robots?
• Please never manually edit the ROS_PACKAGE_PATH
• Try to work with ONE workspace only. In it:
  • Remove devel and build folder,
  • in a clean terminal source only source /opt/ros/melodic/setup.bash
  • build the workspace
• after this, source ~/catkin_ws/devel/setup.bash is sufficient.

• Did you install The package sudo apt-get install ros-melodic-universal-robotsur_description? is not released for meldoic, yet.
  • You can get the source code from https://github.com/ros-industrial/universal_robot/tree/melodic-devel .
  • Clone it from github into a folder in your workspaces src folder
  • Please never manually edit the ROS_PACKAGE_PATH
  • Try to work with ONE workspace only. In it: it:
  • you have one src folder with multiple subfolders, e.g.:
    • universal_robot (from the repo above) and also
    • my_test_pkg (from the MoveIt setup assistant)
  • Remove devel and build folder,
  • in a clean terminal source only source /opt/ros/melodic/setup.bash
  • build the workspace
• after this, source ~/catkin_ws/devel/setup.bash is sufficient.

• The package ur_description is not released for meldoic, yet.
  • You can get the source code from https://github.com/ros-industrial/universal_robot/tree/melodic-devel .
  • Clone it from github into a folder in your workspaces src folder
• Please never manually edit the ROS_PACKAGE_PATH
• Try to work with ONE workspace only. In it:
it:
• you have one src folder with multiple subfolders, e.g.:
  • universal_robot (from the repo above) and also
  • my_test_pkg (from the MoveIt setup assistant)
  • There should also be a file CMakeLists.txt, that was generated by catkin_init_workspace
• Remove devel devel and build build folder,
• in a clean terminal source only source /opt/ros/melodic/setup.bash
• build the workspace
• after this, source ~/catkin_ws/devel/setup.bash is sufficient.