Install language-pack-gnome-el by entering the following commands in the terminal:
sudo apt update sudo apt install language-pack-gnome-el
Description:
GNOME translation updates for language Greek, Modern (1453-)
Translation data updates for all supported GNOME packages for: Greek, Modern (1453-) . language-pack-gnome-el-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