Epic won’t update Fortnite to run on the Steam Deck. Tim Sweeney says Linux is ‘a terrifically hard audience to serve’ (2022)
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Epic won’t update Fortnite to run on the Steam Deck
https://www.theverge.com/2022/2/8/22923163/fortnite-steam-deck-update-epic-tim-sweeney
But you can always install Windows.