I have tried posting on the forums, but I really need help (I'm a server admin and really don't want to have to switch to Windows just to run Minecraft). Anyhow, I originally was running openjdk6 as I was told that 7 was unstable and was getting periodical lag spikes while walking (at least once every 3 seconds the screen would freeze for a tenth of a second).

After that, I attempted to install Sun's Java JDK7 (I couldn't get ahold of 6 without signing up for Oracle's newsletters). Upon attempting to run Minecraft, I got a black screen after logging in with this error message:

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Setting user: Thunder7102, -1618112820878091307
Exception in thread "Minecraft main thread" java.lang.UnsatisfiedLinkError: /home/noiro/.minecraft/bin/natives/liblwjgl.so: /home/noiro/.minecraft/bin/natives/liblwjgl.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch)
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary1(ClassLoader.java:1939)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1864)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1825)
        at java.lang.Runtime.load0(Runtime.java:792)
        at java.lang.System.load(System.java:1059)
        at org.lwjgl.Sys$1.run(Sys.java:69)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.lwjgl.Sys.doLoadLibrary(Sys.java:65)
        at org.lwjgl.Sys.loadLibrary(Sys.java:81)
        at org.lwjgl.Sys.<clinit>(Sys.java:98)
        at org.lwjgl.opengl.Display.<clinit>(Display.java:132)
        at net.minecraft.client.Minecraft.a(SourceFile:184)
        at net.minecraft.client.Minecraft.run(SourceFile:657)
        at java.lang.Thread.run(Thread.java:722)

Now, this got me fed up, so I tried to install a Windows 7 virtual machine through virtualbox, I gave it 256mb of graphics memory with 2D and 3D acceleration and 3GB of RAM. I installed Java JDK7 for Windows (which does work from experience on my other Windows 7 partition). Once again, a black screen after login. What the heck is going on guys?

My System Specs:

Ubuntu 12.04 64bit Fully Updated running Gnome3 Nvidia GTS 450 1.3GB OC'd AMD Athlon II 4x 2.8Ghz 6GB of RAM

So, what do you think?