2.0 is quite out of date, and 3.0 is awesome, look at upgrading (will make your life easier in the long run!)
Exception in thread "LWJGL Application" java.lang.ExceptionInInitializerError
at com.badlogic.gdx.backends.lwjgl.LwjglGraphics.setVSync(LwjglGraphics.java:555)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:122)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
at org.lwjgl.opengl.LinuxDisplay.getAvailableDisplayModes(LinuxDisplay.java:954)
at org.lwjgl.opengl.LinuxDisplay.init(LinuxDisplay.java:738)
at org.lwjgl.opengl.Display.<clinit>(Display.java:138)
... 2 more
This is the usual output I get from LWJGL 2.0....