To install Flatpak on GNU Guix, run the following in a terminal:guix install flatpak
Add the Flathub repository
Flathub is the best place to get Flatpak apps. To enable it, run:flatpak --user 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!
Note: graphical installation of Flatpak apps may not be possible with GNU Guix.