soapUI 3.5.1 on Ubuntu 10.04

Update: soapUI 3.6.1 on Ubuntu 10.10 doesn't have the following problem.

I got following error in my console when I tried to run soapUI on Ubuntu. It was started, after a blank splash screen, but cannot create a project.

Exception in thread "XpcMessageLoop" java.lang.NoSuchMethodError: com.jniwrapper.gtk.GTK.initialize([Ljava/lang/String;)V
    at com.teamdev.xpcom.impl.awt.linux.AwtLinuxPlatform.a(SourceFile:166)
    at com.teamdev.xpcom.impl.E.initialize(SourceFile:69)
    at com.teamdev.xpcom.c.run(SourceFile:150)

The solution is to uncomment the following line in soapui.sh

# JAVA_OPTS="$JAVA_OPTS -Dsoapui.jxbrowser.disable=true"

To set authentication information for a web service, use this dialog box.