I am using a FE software (Abaqus) on either Centos 7 Mate or Ubuntu 18.04 LTS Mate. I think the program uses the default X11 font for the menus and the console window, they cannot be controlled from the program itself. The characters are tiny and difficult to read. The same fonts are used, for instance, by gnuplot X11 terminal by default. How can I change this default font to increase its size?