can't load com.sun.java.swing.plaf.gtk.GTKLookAndFeel

[Pierre Rudloff]

pierre@pierre-MacBook:~$ omegat
14784: Info: ===================================================================
14784: Info: OmegaT-2.3.0_1 (Fri Oct 12 11:45:45 CEST 2012) Locale en_US
14784: Info: Java: Sun Microsystems Inc. ver. 1.6.0_24, executed from '/usr/lib/jvm/java-6-openjdk-i386/jre' (LOG_STARTUP_INFO)
Exception in thread "main" java.lang.Error: can't load com.sun.java.swing.plaf.gtk.GTKLookAndFeel
 at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1326)
 at javax.swing.UIManager.initialize(UIManager.java:1407)
 at javax.swing.UIManager.maybeInitialize(UIManager.java:1395)
 at javax.swing.UIManager.getDefaults(UIManager.java:644)
 at javax.swing.UIManager.getColor(UIManager.java:686)
 at com.vlsolutions.swing.docking.ui.DockingUISettings.<init>(DockingUISettings.java:219)
 at com.vlsolutions.swing.docking.ui.DockingUISettings.getInstance(DockingUISettings.java:232)
 at com.vlsolutions.swing.docking.DockingDesktop.<clinit>(DockingDesktop.java:139)
 at org.omegat.Main.runGUI(Main.java:189)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: omegat 2.3.0.1+dfsg-3
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
Uname: Linux 3.2.0-31-generic-pae i686
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
Date: Fri Oct 12 11:43:49 2012
Dependencies:
 libhtmlparser-java 1.6.20060610.dfsg0-3
 libswing-layout-java 1.0.4-2
 libvldocking-java 2.1.4-4
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=fr_FR:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: omegat
UpgradeStatus: Upgraded to precise on 2012-04-27 (168 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.