All issues seem to be resolved.

Downgraded to Java 8.
Reinstalled FileBot.
Added license.
Modified script.

Thank you.

I ran the installer using:
bash -xu <<< "$(curl -fsSL https://raw.githubusercontent.com/filebot/plugins/master/installer/deb.sh)"

apt-cache show openjfx --no-all-versions
results in:
# apt-cache show openjfx --no-all-versions
Package: openjfx
Architecture: amd64
Version: 11.0.2+1-1~18.04.2 ...

I've been running an old portable version of Filebot. I want to run the latest and will buy a lifetime license.

I have tried updating before and always ran into a problem. And this time as well. But let's get this working.

I have a headless server running Linux Mint 19.

I installed Filebot using ...