Follow these simple steps to start using Flatpak
The official Flatpak PPA is the recommended way to install Flatpak. To install it, run the following in the Terminal:
$ sudo apt install software-properties-common --no-install-recommends $ sudo add-apt-repository ppa:alexlarsson/flatpak $ sudo apt update $ sudo apt install flatpak
Flathub is the best place to get Flatpak apps. To enable it, run:
$ flatpak remote-add --if-not-exists flathub https://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 elementary OS.