PX4 Developement Environment Bootup error

Hello, I tried to set up the PX4 development environment on Ubunutu on my Windows Laptop. I followed the steps on the following PX4 page:

The terminal then reads “Build Successful” and a “Starting GUI”. Following this I get the message pasted below:

Exception in thread “main” java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:61)
Caused by: java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:208)
at java.desktop/java.awt.Window.(Window.java:548)
at java.desktop/java.awt.Frame.(Frame.java:423)
at java.desktop/java.awt.Frame.(Frame.java:388)
at java.desktop/javax.swing.JFrame.(JFrame.java:180)
at me.drton.jmavsim.Visualizer3D.(Visualizer3D.java:107)
at me.drton.jmavsim.Simulator.(Simulator.java:193)
at me.drton.jmavsim.Simulator.main(Simulator.java:944)

Please let me know what steps I can take to resolve this. Thank you.

I also have the same problem. Have you resolved it?