Install fonts-khmeros-core by entering the following commands in the terminal:
sudo apt update sudo apt install fonts-khmeros-core
Description:
KhmerOS Unicode fonts for the Khmer language of Cambodia
Free fonts for the Khmer language, used in Cambodia, developed by the Khmer Software Iniative, part of the Open Forum of Cambodia. . This package provides Khmer OS fonts for use in the default Ubuntu desktop.
Homepage: http://www.khmeros.info
Version: 5.0-7ubuntu1
Section: fonts