Minecraft on ubuntu

Starting point is

• the latest minecraft jar downloaded from here:

https://minecraft.net/download

• Oracle java7 (I think this is preferred for minecraft)

rday@muno:~/.minecraft/bin$ java -version
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) Server VM (build 23.5-b02, mixed mode)

• Ubuntu 12.10 quantal

rday@muno:~/.minecraft/bin$ java -jar minecraft.jar 
Exception in thread "main" java.lang.NoClassDefFoundError: org/lwjgl/LWJGLException
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
	at java.lang.Class.getMethod0(Class.java:2685)
	at java.lang.Class.getMethod(Class.java:1620)
	at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:492)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:484)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.LWJGLException
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
	... 6 more

The class referenced in the error is present in ~/.minecraft/bin/lwjgl.jar I see it when I "vi lwjgl.jar" and search for Exception Why are the other jars in bin not seen?

Refresh procedure:

• rm -rf ~/.minecraft
• java -jar ~/Downloads/minecraft.jar

This reinstalls everything in the .minecraft directory, but then fails with this error:

rday@muno:~/Downloads$ java -jar minecraft.jar 
asdf
java.io.FileNotFoundException: /home/rday/.minecraft/lastlogin (No such file or directory)
	at java.io.FileInputStream.open(Native Method)
	at java.io.FileInputStream.<init>(FileInputStream.java:138)
	at net.minecraft.LoginForm.readUsername(LoginForm.java:110)
	at net.minecraft.LoginForm.<init>(LoginForm.java:55)
	at net.minecraft.LauncherFrame.<init>(LauncherFrame.java:23)
	at net.minecraft.LauncherFrame.main(LauncherFrame.java:167)
	at net.minecraft.MinecraftLauncher.main(MinecraftLauncher.java:13)
Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: /home/rday/.minecraft/bin/natives/liblwjgl.so: libjawt.so: cannot open shared object file: No such file or directory
	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)