geogebra crashes in Ubuntu 20.04

Hi

I run successfully 5.0.620.0-50 on Ubuntu 16.04.

However a colleague of mine runs Ubuntu 20.04

Now either GeoGebra 5.0.634.0 (using a deb provided by geogebra) or what

is called a stand alone geobgebra crashes with the following error messages:

17:51:46.193 DEBUG: org.geogebra.desktop.j.a.<init>[-1]:

isApplet=false runningFromJar=true

17:51:46.193 DEBUG: org.geogebra.desktop.j.a.aD[-1]: Setting up logging

17:51:46.223 DEBUG: org.geogebra.desktop.j.a.aD[-1]: Logging is

redirected to /tmp/GeoGebraLog_mtvcvypbvi.txt

java: Fatal IO error 9 (Bad file descriptor) on X server :0.

[kcrash] TDECrash: Application 'jfxrt.jar-gtk-tqt-application' crashing...

GeoGebra 5.0.634.0 26 March 2021 Java 1.8.0_121-64bit

18:48:49.848 DEBUG: org.geogebra.desktop.j.a.<init>[-1]:

isApplet=false runningFromJar=true

18:48:49.849 DEBUG: org.geogebra.desktop.j.a.aD[-1]: Setting up logging

18:48:49.872 DEBUG: org.geogebra.desktop.j.a.aD[-1]: Logging is

redirected to /tmp/GeoGebraLog_ytjxawviur.txt

java: Fatal IO error 9 (Bad file descriptor) on X server :0.

[kcrash] TDECrash: Application

'geogebra.properties-gtk-tqt-application' crashing...

this happens whenever something is written in the input and enter is pressed.

Any help is strongly appreciated

Uwe Brauer

Any idea?

regards

Uwe Brauer