There is librelingo but, honestly, it's far behind Duolingo.
The closest software I found is to use a flashcard tool (like AnkiDroid) and then search for an open deck of your language using AnkiWeb.
Doing so you get a similar experience than DuoLingo without the gamification and pretty UI.
I personally run Debian in Testing and I have not the latest version but I think it's still fine.
There is librelingo but, honestly, it's far behind Duolingo.
The closest software I found is to use a flashcard tool (like AnkiDroid) and then search for an open deck of your language using AnkiWeb.
Doing so you get a similar experience than DuoLingo without the gamification and pretty UI.