Install language-pack-gnome-si by entering the following commands in the terminal:
sudo apt update sudo apt install language-pack-gnome-si
Description:
GNOME translation updates for language Sinhala; Sinhalese
Translation data updates for all supported GNOME packages for: Sinhala; Sinhalese . language-pack-gnome-si-base provides the bulk of translation data and is updated only seldom. This package provides frequent translation updates.
Version: 1:18.04+20180423
Section: translations