Install fonts-lklug-sinhala by entering the following commands in the terminal:
sudo apt update sudo apt install fonts-lklug-sinhala
Description:
Unicode Sinhala font by Lanka Linux User Group
This package provides the Unicode Sinhala font developed by the Lanka Linux User Group (LKLUG)
Homepage: http://www.lug.lk/fonts/lklug
Version: 0.6-3
Section: fonts