Launcher won't open in Linux

[I rag you 0]

Could not locate proxy file!
Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: com/sun/awt/AWTUtilities$Translucency
	at org.pushingpixels.substance.internal.utils.SubstanceCoreUtilities.isRoundedCorners(SubstanceCoreUtilities.java:504)
	at org.pushingpixels.substance.internal.ui.SubstanceRootPaneUI.__org__pushingpixels__substance__internal__ui__SubstanceRootPaneUI__installUI(SubstanceRootPaneUI.java:226)
	at org.pushingpixels.substance.internal.ui.SubstanceRootPaneUI.installUI(SubstanceRootPaneUI.java)
	at java.desktop/javax.swing.JComponent.setUI(JComponent.java:685)
	at java.desktop/javax.swing.JRootPane.setUI(JRootPane.java:449)
	at java.desktop/javax.swing.JRootPane.updateUI(JRootPane.java:459)
	at java.desktop/javax.swing.SwingUtilities.updateComponentTreeUI0(SwingUtilities.java:1363)
	at java.desktop/javax.swing.SwingUtilities.updateComponentTreeUI0(SwingUtilities.java:1378)
	at java.desktop/javax.swing.SwingUtilities.updateComponentTreeUI(SwingUtilities.java:1354)
	at org.pushingpixels.substance.api.SubstanceLookAndFeel.setSkin(SubstanceLookAndFeel.java:2091)
	at org.pushingpixels.substance.api.SubstanceLookAndFeel.setSkin(SubstanceLookAndFeel.java:2184)
	at org.dreambot.launcher.DreamLauncher.lambda$main$0(DreamLauncher.java:19)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: java.lang.ClassNotFoundException: com.sun.awt.AWTUtilities$Translucency
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	... 25 more

I am trying to run DreamBot on a Linux machine but can't load the standalone jar. The output is shown above. I have an x86 system which run Xubuntu. Is anyone else experiencing the same issues?

[Neffarion 486]

What java version are you running? 
Type: java -version
In the terminal