The issue is fixed by installing openjfx in Ubuntu. This should be a dependency during installation or embedded in the executable.

Same issue here.
FileBot 4.7.1 (r4126) / OpenJDK Runtime Environment 1.8.0_91
When I try to rename a file:
Failed to initialize JavaFX
java.lang.NoClassDefFoundError: javafx/embed/swing/JFXPanel
at net.filebot.util.ui.SwingUI.initJavaFX(SwingUI.java:423)
at net.filebot.Main.main(Main.java:148 ...