Salve a tutti,
non riesco a capire perchè quando compilo e mando in esecuzione programmini java su linux (Ubuntu 6.06 con j2sdk-1_4_2_11-nb-5_0-linux) mi da codici di errore sempre del genere:

codice:
>javac BorderTest.java
>Exit code: 0
>java BorderTest
Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(libgcj.so.7)
   at java.awt.Window.<init>(libgcj.so.7)
   at java.awt.Frame.<init>(libgcj.so.7)
   at javax.swing.JFrame.<init>(libgcj.so.7)
   at BorderFrame.<init>(BorderTest.java:26)
   at BorderTest.main(BorderTest.java:11)
Caused by: java.lang.ClassNotFoundException: gnu.java.awt.peer.gtk.GtkToolkit
   at java.lang.Class.forName(libgcj.so.7)
   at java.lang.Class.forName(libgcj.so.7)
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   ...6 more
>Exit code: 0
oppure:

codice:
>javac RadioButtonTest.java
>Exit code: 0
>java RadioButtonTest
Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(libgcj.so.7)
   at java.awt.Window.<init>(libgcj.so.7)
   at java.awt.Frame.<init>(libgcj.so.7)
   at javax.swing.JFrame.<init>(libgcj.so.7)
   at RadioButtonFrame.<init>(RadioButtonTest.java:28)
   at RadioButtonTest.main(RadioButtonTest.java:10)
Caused by: java.lang.ClassNotFoundException: gnu.java.awt.peer.gtk.GtkToolkit
   at java.lang.Class.forName(libgcj.so.7)
   at java.lang.Class.forName(libgcj.so.7)
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   ...6 more
>Exit code: 0
oppure:

codice:
>javac ComboBoxTest.java
>Exit code: 0
>java ComboBoxTest
Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(libgcj.so.7)
   at java.awt.Window.<init>(libgcj.so.7)
   at java.awt.Frame.<init>(libgcj.so.7)
   at javax.swing.JFrame.<init>(libgcj.so.7)
   at ComboBoxFrame.<init>(ComboBoxTest.java:27)
   at ComboBoxTest.main(ComboBoxTest.java:10)
Caused by: java.lang.ClassNotFoundException: gnu.java.awt.peer.gtk.GtkToolkit
   at java.lang.Class.forName(libgcj.so.7)
   at java.lang.Class.forName(libgcj.so.7)
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
   ...6 more
>Exit code: 0
Mentre usando Windows XP PRO non mi da nessun problema e riesco a mandarli in esecuzione. Perchè???
[cry+] [cry+] [cry+]

Grazie mille per una vostra risposta.