I can not start JPCSP 2142 in linux

[kinrpg]

Hi Boy, how are you?
Good.

My Problems.

I use ubuntu 4.11 have java installed and working (eg use it to run the eclipse and the rune scape), but I can not run jpcsp.

I downloaded several verses of the emulator, unzip the folder and try running it does not work.

Command:

Code:

sh start-linux-x86.sh

After pressing the enter key appreciate the error.

Code:

Exception in thread "main" java.lang.NoClassDefFoundError: jpcsp/MainGUI
Caused by: java.lang.ClassNotFoundException: jpcsp.MainGUI
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: jpcsp.MainGUI. Program will exit.

I searched on google, I used the web forum but found no solution.
Could someone give me a hand?

Thank you.

my pc

AMD Sempron™ Processor LE-1200
2.1 GHZ
1 GB Ram
Geforce fx5200