how to Add "Video Device" (GUI) on WSL2 - Ruby2D Issue

I'm using WSL2 on Ubuntu 18.04 to run Ruby code in Windows 10.For example, running Ruby on Rails is easily done with no special setup required.

In case of Ruby2D:The installation went fine but, I get an error when running any Ruby2D file, even the most basic one:

require 'ruby2d'show

I get this error in Console:

error: XDG_RUNTIME_DIR not set in the environment.Error: (SDL_Init) No available video deviceerror: XDG_RUNTIME_DIR not set in the environment.Error: (SDL_CreateWindow) No available video deviceError: (GL2 / SDL_GL_CreateContext) Video subsystem has not been initializedError: An OpenGL context could not be created

How do I "add" (or config) a "video device" to my Ubuntu on the WSL2?