Eclipse - no inicia tras cargar pack-language

Hola, he cargado dos paquetes de idiomas para el entorno de eclipse, castellano y euskera, y tras reiniciar me lanza una ventana de alerta pidiendome que me dirija al log de .metadata del directorio de trabajo.

He copiado la parte correspondiente a ese inicio, pero no me atrevo a borrar nada. Agradecería algún apoyo.

!SESSION 2016-06-24 12:45:28.188 -----------------------------------------------
eclipse.buildId=4.5.2.M20160212-1500
java.version=1.8.0_91
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=es_ES
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.osgi 4 0 2016-06-24 12:45:56.543
!MESSAGE Error de aplicación
!STACK 1
java.lang.LinkageError: loader constraint violation: when resolving method "org.eclipse.e4.ui.bindings.internal.BindingTable.addBinding(Lorg/eclipse/jface/bindings/Binding;)V" the class loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) of the current class, org/eclipse/e4/ui/workbench/swt/util/BindingProcessingAddon, and the class loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) for the method's defining class, org/eclipse/e4/ui/bindings/internal/BindingTable, have different Class objects for the type org/eclipse/jface/bindings/Binding used in the signature
at org.eclipse.e4.ui.workbench.swt.util.BindingProcessingAddon.defineBinding(BindingProcessingAddon.java:192)
at org.eclipse.e4.ui.workbench.swt.util.BindingProcessingAddon.defineBindingTable(BindingProcessingAddon.java:176)
at org.eclipse.e4.ui.workbench.swt.util.BindingProcessingAddon.defineBindingTables(BindingProcessingAddon.java:154)
at org.eclipse.e4.ui.workbench.swt.util.BindingProcessingAddon.init(BindingProcessingAddon.java:102)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:898)
at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:121)
at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:345)
at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:278)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:186)
at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:107)
at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:73)
at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:50)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:283)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:628)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:606)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)

He borrado Eclipse de /opt y el dir de configuración $HOME/.eclipse y un apt-get remove eclipse* por si quedaba algún rastro de él, y he instalado NetBeans.