>
> Take a look in the link below... It is a GUI tool
> Open Source and free, being developed by RedSoft:
> https://www.firebirdnews.org/redexpert-1-0-6-released/
>

Thank you.

I've tested the installation of another Linux workstation (also Ubuntu 18.04 LTS): "Red Expert" installs well ==> So, I have a "Java Runtime Environment problem" on the first workstation.