Ubuntu font package fonts-khmeros

You can install these fonts by opening a terminal and executing sudo apt-get install "fonts-khmeros"

Khmer OS Battambang font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSbattambang.ttf

Khmer OS Bokor font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSbokor.ttf

Khmer OS Content font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOScontent.ttf

Khmer OS Fasthand font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSfasthand.ttf

Khmer OS Freehand font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSfreehand.ttf

Khmer OS Metal Chrieng font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSmetalchrieng.ttf

Khmer OS Muol font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSmuol.ttf

Khmer OS Muol Light font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSmuollight.ttf

Khmer OS Muol Pali font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSmuolpali.ttf

Khmer OS Siemreap font family with style Normal
/usr/share/fonts/truetype/ttf-khmeros/KhmerOSsiemreap.ttf