Gnuplot does not produce plots

Dear FLAIR experts,
I have updated my machine from Ubuntu 18.04 to 20.04 and now I can’t see the plots created by Gnuplot. Please refer to the attached screenshots.
Gnuplot version - Version 5.2 patchlevel 8.
Flair version: 3.1-15.1.

How can I solve the problem?
Thank you in advance,
Hen Shukrun

Dear Rachel,
it seems that some of Gnuplot libraries have been removed during the Ubuntu update or become incompatible. Do you run your Ubunto on the machine directly or using WLS on Windows?
For me the easiest way is to reinstall your FLUKA/FLAIR after the Ubuntu update, for me it is faster then to determine which exactly library/path have been corrupted.

Kind regards,