I can confirm this issue, having the same problem in Ubuntu Mate 18.04 Beta2.
this is the terminal output: 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_bixyoyudww.txt ** Attachment added: "GeoGebraLog" https://bugs.launchpad.net/ubuntu/+source/geogebra/+bug/1761977/+attachment/5125479/+files/GeoGebraLog_bixyoyudww.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1761977 Title: geogebra fails to start due to Java casting problem To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/geogebra/+bug/1761977/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs