from https://wiki.scilab.org/Graphical%20issues%20with%20Scilab%205.X
try adding LIBGL_ALWAYS_SOFTWARE=1 in front of the scilab command
from https:/ /wiki.scilab. org/Graphical% 20issues% 20with% 20Scilab% 205.X
try adding LIBGL_ALWAYS_ SOFTWARE= 1 in front of the scilab command