Erro ao instalar minecraft SP

[Vitvit88]

Eu estou usando o Ubuntu 11.10 32 bits,e quero instalar o minecraft sp (pirata), eu tento mas toda vez aparece isso:

     Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem.




--- BEGIN ERROR REPORT 7cf3a456 --------
Generated 19/05/12 15:40

Minecraft: Minecraft 1.2.5
OS: Linux (i386) version 3.2.5-030205-generic-pae
Java: 1.6.0_23, Sun Microsystems Inc.
VM: OpenJDK Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
[failed to get system properties (java.lang.NullPointerException)]

org.lwjgl.LWJGLException: Could not init GLX
   at org.lwjgl.opengl.LinuxDisplayPeerInfo.initDefaultPeerInfo(Native Method)
   at org.lwjgl.opengl.LinuxDisplayPeerInfo.<init>(LinuxDisplayPeerInfo.java:52)
   at org.lwjgl.opengl.LinuxDisplay.createPeerInfo(LinuxDisplay.java:684)
   at org.lwjgl.opengl.Display.create(Display.java:854)
   at org.lwjgl.opengl.Display.create(Display.java:784)
   at org.lwjgl.opengl.Display.create(Display.java:765)
   at net.minecraft.client.Minecraft.a(SourceFile:236)
   at net.minecraft.client.Minecraft.run(SourceFile:657)
   at java.lang.Thread.run(Thread.java:679)
--- END ERROR REPORT 5c5918bc ----------

Alguem sabe o que isso significa ou como consertar?