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[This is the complete error report]

--- BEGIN ERROR REPORT c253017f --------
Full report at:
/home/[censored]/.minecraft/crash-reports/crash-2013-03-09_19.37.48-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 3/9/13 7:37 PM

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Linux (i386) version 3.5.0-26-generic
Java Version: 1.7.0_15, Oracle Corporation
Java VM Version: OpenJDK Client VM (mixed mode, sharing), Oracle Corporation
Memory: 7094640 bytes (6 MB) / 36917248 bytes (35 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.8.5
OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null[failed to get system properties (java.lang.RuntimeException: No OpenGL context found in the current thread.)]


org.lwjgl.LWJGLException: X Error - disp: 0xffffffffb40a0f78 serial: 28 error: BadRequest (invalid request code or no such operation) request_code: 153 minor_code: 14
at org.lwjgl.opengl.LinuxDisplay.globalErrorHandler(LinuxDisplay.java:318)
at org.lwjgl.opengl.LinuxDisplayPeerInfo.initDefaultPeerInfo(Native Method)
at org.lwjgl.opengl.LinuxDisplayPeerInfo.<init>(LinuxDisplayPeerInfo.java:61)
at org.lwjgl.opengl.LinuxDisplay.createPeerInfo(LinuxDisplay.java:788)
at org.lwjgl.opengl.DrawableGL.setPixelFormat(DrawableGL.java:61)
at org.lwjgl.opengl.Display.create(Display.java:843)
at org.lwjgl.opengl.Display.create(Display.java:754)
at org.lwjgl.opengl.Display.create(Display.java:736)
at net.minecraft.client.Minecraft.a(SourceFile:232)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Thread.java:722)
--- END ERROR REPORT fd349b2f ----------

It worked just fine before I updated from 12.04 to 12.10.

I've fixed this. Don't update to Ubuntu 12.10 it's too buggy and unstable for games that need OpenGL to play them.