Alright, then I think you might be able to just follow the instructions from this answer:
try running
sudo apt-get install t1-xfree86-nonfree ttf-xfree86-nonfree ttf-xfree86-nonfree-syriac xfonts-75dpi xfonts-100dpi
and then restart your computer. Hopefully that will work. If not we'll need to dive deeper.