When attempting to launch minecarft in ubuntu linux, I get the following error in the terminal. This error occurs after I log in and before the mojang logo appears.

viper@Viper-PC:~/Downloads/Games/Minecraft$ jre1.7.0_17/bin/java -jar minecraft.jar
asdf
Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: /home/viper/.minecraft/bin/natives/liblwjgl.so: /home/viper/.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(Unknown Source)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
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.G(SourceFile:1985)
at awe.<init>(SourceFile:20)
at net.minecraft.client.Minecraft.<init>(SourceFile:76)
at avv.<init>(SourceFile:38)
at net.minecraft.client.MinecraftApplet.init(SourceFile:38)
at net.minecraft.Launcher.replace(Launcher.java:136)
at net.minecraft.Launcher$1.run(Launcher.java:79)