K, I've run into something of a problem... I just updated my system to Ubuntu 10.10, and now I can't get Minecraft to start. The launcher screen appears, and I enter log-in information, but nothing after that. Here's the output...

Minecraft: Minecraft Alpha v1.1.2_01
OS: Linux (i386) version 2.6.35-22-generic-pae
Java: 1.6.0_20, Sun Microsystems Inc.
VM: OpenJDK Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
[failed to get system properties (java.lang.NullPointerException)]

java.lang.IllegalStateException: Only one LWJGL context may be instantiated at any one time.
at org.lwjgl.opengl.Display.create(Display.java:846)
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:196)
at net.minecraft.client.Minecraft.run(SourceFile:554)
at java.lang.Thread.run(Thread.java:636)

I know there are a few linux junkies on here more knowledgeable than I. So before I revert to Ubuntu 10.4, was wondering if anyone of you would know how to fix it. I already posted something on the minecraft forums, but no responses yet.

Update Java, graphics drivers too. Thats all I know for now.

mmk, just wrestled with my computer for a bit to get the latest Sun Java installed on my computer... And the same problem occurs. Here's the output...

Minecraft: Minecraft Alpha v1.1.2_01
OS: Linux (i386) version 2.6.35-22-generic-pae
Java: 1.6.0_22, Sun Microsystems Inc.
VM: Java HotSpot(TM) Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
[failed to get system properties (java.lang.NullPointerException)]

java.lang.IllegalStateException: Only one LWJGL context may be instantiated at any one time.
at org.lwjgl.opengl.Display.create(Display.java:846)
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:196)
at net.minecraft.client.Minecraft.run(SourceFile:554)
at java.lang.Thread.run(Thread.java:662)

I'll work on the graphics drivers now...

It sounds like something else is running lwjgl (a java opengl library) on your system...

does that happen w/ no other windows open? try disabling compiz...

what is the output of glxinfo?