Geogebra du dépôt apt meurt silencieusement sur ubuntu 18.04

Aujourd'hui, j'ai couru

sudo apt install geogebra geogebra-gnome

sur un ubuntu 18.04 standard. L'exécution de geogebra, soit par le lanceur gnome, soit par le terminal, fait apparaître l'écran d'accueil puis se termine silencieusement.

Voici à quoi cela ressemble en l'exécutant dans le terminal :

$ geogebra
GeoGebra 4.0.34.0 (Debian version 4.0.34.0+dfsg1-4) 22 June 2012 Java 10.0.1
*** Message from [geogebra.main.Application.setUpLogging]
    /tmp/GeoGebraLog_qrhdpnnfig.txt

Voici le fichier journal mentionné depuis le terminal

Jun 05, 2018 7:52:18 AM  
STDOUT:   current views:

Jun 05, 2018 7:52:19 AM  
STDOUT: geogebra.euclidian.EuclidianView[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=java.awt.Dimension[width=20,height=20],preferredSize=]

Jun 05, 2018 7:52:19 AM  
STDERR: XXXXXXXXX Number of registered views = 1
Jun 05, 2018 7:52:19 AM  
STDOUT: class geogebra.euclidian.EuclidianView
Jun 05, 2018 7:52:20 AM  
STDERR: *** Message from [geogebra.gui.view.algebra.AlgebraView.<init>]
Jun 05, 2018 7:52:20 AM  
STDERR:     
Jun 05, 2018 7:52:20 AM  
STDERR: XXX creating Algebra View XXX
Jun 05, 2018 7:52:20 AM  
STDOUT:   current views:

Jun 05, 2018 7:52:20 AM  
STDOUT: geogebra.euclidian.EuclidianView[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=java.awt.Dimension[width=20,height=20],preferredSize=java.awt.Dimension[width=640,height=480]]

Jun 05, 2018 7:52:20 AM  
STDOUT: geogebra.gui.view.algebra.AlgebraView[,0,0,0x0,invalid,alignmentX=0.0,alignmentY=0.0,border=javax.swing.border.EmptyBorder@512d92b,flags=16777576,maximumSize=,minimumSize=,preferredSize=,editable=true,invokesStopCellEditing=true,largeModel=true,rootVisible=false,rowHeight=-1,scrollsOnExpand=true,showsRootHandles=false,toggleClickCount=1,visibleRowCount=20]

Jun 05, 2018 7:52:20 AM  
STDERR: XXXXXXXXX Number of registered views = 2
Jun 05, 2018 7:52:20 AM  
STDOUT: class geogebra.euclidian.EuclidianView
Jun 05, 2018 7:52:20 AM  
STDOUT: class geogebra.gui.view.algebra.AlgebraView
Jun 05, 2018 7:52:20 AM  
STDOUT: *** Message from [geogebra.main.GeoGebraPreferences.loadPrefsSystem]
Jun 05, 2018 7:52:20 AM  
STDOUT:     
Jun 05, 2018 7:52:20 AM  
STDOUT: system preference /geogebra does not exist
Jun 05, 2018 7:52:20 AM  
STDOUT: *** Message from [geogebra.main.GeoGebraPreferences.loadVersionCheckAllow]
Jun 05, 2018 7:52:20 AM  
STDOUT:     
Jun 05, 2018 7:52:20 AM  
STDOUT: no ggbPrefsSystem : systemAllows = true
Jun 05, 2018 7:52:20 AM  
STDOUT: *** Message from [geogebra.main.Application.setVersionCheckAllowed]
Jun 05, 2018 7:52:20 AM  
STDOUT:     
Jun 05, 2018 7:52:20 AM  
STDOUT: versionCheckAllowed = true
Jun 05, 2018 7:52:20 AM  
STDERR: java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.plugin.ClassPathManipulator.addURL(ClassPathManipulator.java:68)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.plugin.PluginManager.<init>(PluginManager.java:80)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.main.Application.getPluginManager(Application.java:5048)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.main.Application.<init>(Application.java:612)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.main.Application.<init>(Application.java:467)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.gui.app.GeoGebraFrame.createApplication(GeoGebraFrame.java:288)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.gui.app.GeoGebraFrame.createNewWindow(GeoGebraFrame.java:311)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.gui.app.GeoGebraFrame.createNewWindow(GeoGebraFrame.java:276)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.gui.app.GeoGebraFrame.init(GeoGebraFrame.java:242)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.gui.app.GeoGebraFrame.main(GeoGebraFrame.java:196)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.GeoGebra.startGeoGebra(GeoGebra.java:103)
Jun 05, 2018 7:52:20 AM  
STDERR:     at geogebra.GeoGebra.main(GeoGebra.java:88)

J'ai lancé ps ax en cherchant java ou geogebra et rien ne semble fonctionner. Avez-vous une idée ?