We've set up builds for GOG for mac and linux, since we did the same for Steam.

I've downloaded the linux version, how can i play in french? i see nothing to change the language ingame. The name of the installer is gog_primordia_2.0.0.2.sh.

I have the same problem, in my case to play in Spanish. Downloading the Linux version there is no selector on the home screen of the game to choose the language, as you have in the Wíndows version.

gog_primordia_2.0.0.2.sh is the old English-only build of the game.
The current build is primordia_italian_53699.sh, it comes with support for:
- French
- English
- German
- Italian
- Spanish

Thanks you are right, the new build has the languages available.