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i get to the minecraft log in screen, i type in my info and i says downloading for a brief second, then it goes black and nothing happens i get this message in terminal. i start minecraft up by doing this command: java -jar minecraft.jar

Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: /home/james.morris/.minecraft/bin/natives/liblwjgl.so: /home/james.morris/.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 net.minecraft.client.Minecraft.F(SourceFile:1975)
at asr.<init>(SourceFile:20)
at net.minecraft.client.Minecraft.<init>(SourceFile:75)
at asi.<init>(SourceFile:36)
at net.minecraft.client.MinecraftApplet.init(SourceFile:36)
at net.minecraft.Launcher.replace(Launcher.java:136)
at net.minecraft.Launcher$1.run(Launcher.java:79)

the problem is I can't find that "lwjgl" file i know it's the problem, but i can't find it even when i show hidden files.