Install fonts-freefarsi by entering the following commands in the terminal:
sudo apt update sudo apt install fonts-freefarsi
Description:
FreeFarsi TrueType Persian fonts
FPF project aims to provide a free TrueType Persian font covering its part of ISO 10464/Unicode UCS (Universal Characters Set).
Homepage: http://fpf.sourceforge.net
Version: 1.0.0~beta1-7
Section: universe/fonts