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645.

Flatpak: Can't check signature: public key not found [Answer]

askubuntu.com/a/1485473

flatpak remote-delete --force flathub
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

Something was supremely fucked up with my Steam OS install and I couldn't install anything from Flathub, but this fixed it.