I use kettle in linux first time.jdk has already configured.when I input command——"sh spoon.sh" , the screen display——

.
./libswt/linux/x86_64/
ERROR 07-07 12:17:27,717 - Spoon - Fatal error : java.lang.UnsatisfiedLinkError: no swt-gtk-3346 or swt-gtk in swt.library.path, java.library.path or the jar file
ERROR 07-07 12:17:27,719 - Spoon - java.lang.UnsatisfiedLinkError: no swt-gtk-3346 or swt-gtk in swt.library.path, java.library.path or the jar file
at org.eclipse.swt.internal.Library.loadLibrary(Unknown Source)
at org.eclipse.swt.internal.Library.loadLibrary(Unknown Source)
at org.eclipse.swt.internal.C.<clinit>(Unknown Source)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Unknown Source)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Unknown Source)
at org.eclipse.swt.widgets.Display.<clinit>(Unknown Source)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:378)
Exception in thread "main" java.lang.NullPointerException
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:420)

how to fix it?

My English is very pool,so...

Thank u very much