Description:
Startup fails with errors:

[code]java.lang.RuntimeException: com.intellij.ide.plugins.PluginManager$StartupAbortedException: Fatal error initializing 'com.intellij.ide.ui.LafManager'
at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:216)
at com.intellij.idea.IdeaApplication.lambda$initApplication$0(IdeaApplication.java:75)
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.access$600(EventQueue.java:97)
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:87)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:361)
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: com.intellij.ide.plugins.PluginManager$StartupAbortedException: Fatal error initializing 'com.intellij.ide.ui.LafManager'
at com.intellij.ide.plugins.PluginManager.handleComponentError(PluginManager.java:257)
at com.intellij.openapi.components.impl.PlatformComponentManagerImpl.handleInitComponentError(PlatformComponentManagerImpl.java:43)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:506)
at com.intellij.openapi.components.impl.ComponentManagerImpl.createComponents(ComponentManagerImpl.java:107)
at com.intellij.openapi.application.impl.ApplicationImpl.lambda$createComponents$9(ApplicationImpl.java:446)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:580)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
at com.intellij.openapi.application.impl.ApplicationImpl.createComponents(ApplicationImpl.java:453)
at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:91)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:405)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:391)
at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:209)
... 16 more
Caused by: java.lang.NoClassDefFoundError: com/sun/java/swing/plaf/windows/WindowsLookAndFeel
at com.intellij.ide.ui.laf.IdeaLaf.initIdeaDefaults(IdeaLaf.java:81)
at com.intellij.ide.ui.laf.IdeaLaf.initComponentDefaults(IdeaLaf.java:28)
at java.desktop/javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:150)
at java.desktop/javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1560)
at com.intellij.ide.ui.laf.darcula.DarculaLaf.getDefaults(DarculaLaf.java:95)
at java.desktop/javax.swing.UIManager.setLookAndFeel(UIManager.java:587)
at com.intellij.ide.ui.laf.LafManagerImpl.setCurrentLookAndFeel(LafManagerImpl.java:395)
at com.intellij.ide.ui.laf.LafManagerImpl.initComponent(LafManagerImpl.java:191)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:488)
... 28 more
Caused by: java.lang.ClassNotFoundException: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:224)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:566)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
... 37 more
[/code]

Additional info:
* package version(s) - 2018.2.4-1

Steps to reproduce:
Just launch app

Btw, upstream version works like a charm.