To install Flatpak, set NixOS option
trueby putting the following into your
/etc/nixos/configuration.nix:services.flatpak.enable = true;
Then, rebuild and switch to the new configuration with:sudo nixos-rebuild switch
For more details see the NixOS documentation.
Add the Flathub repository
Flathub is the best place to get Flatpak apps. To enable it, run:flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
To complete setup, restart your system. Now all you have to do is install some apps!