Seemingly a duplicate of #1761977 - Geogebra 4 (which the developers no longer support: https://help.geogebra.org/topic/error-when-loading-geogebra ) will not run under JDK ≥9 unless patched.
Maybe best to use one of the packages from http://www.geogebra.net/ instead of the Ubuntu one, because it sounds like the Ubuntu maintainer has moved on to other things.
Seemingly a duplicate of #1761977 - Geogebra 4 (which the developers no longer support: https:/ /help.geogebra. org/topic/ error-when- loading- geogebra ) will not run under JDK ≥9 unless patched.
Maybe best to use one of the packages from http:// www.geogebra. net/ instead of the Ubuntu one, because it sounds like the Ubuntu maintainer has moved on to other things.