To downgrade openjfx to version 8 and put the packages on hold so they don't get updated the next time you do a system update:
sudo apt install libopenjfx-java=8u161-b12-1ubuntu2 libopenjfx-jni=8u161-b12-1ubuntu2 openjfx=8u161-b12-1ubuntu2 sudo apt-mark hold libopenjfx-java libopenjfx-jni openjfx -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1825054 Title: My JavaFx project stopped compiling To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openjfx/+bug/1825054/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs