Install jsmath-fonts by entering the following commands in the terminal:
sudo apt update sudo apt install jsmath-fonts
Description:
raster fonts for jsMath
Rasterized fonts saved in image files to enable viewing of jsMath pages by a web-browser which is missing access to TeX fonts.
Homepage: http://www.math.union.edu/~dpvc/jsMath
Version: 1.3-3ubuntu1
Section: universe/web