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Install Flatpak
To install Flatpak on Ubuntu 18.10 (Cosmic Cuttlefish) or later, simply run:
$ sudo apt install flatpak
With older Ubuntu versions, the official Flatpak PPA is the recommended way to install Flatpak. To install it, run the following in a terminal:
$ sudo add-apt-repository ppa:alexlarsson/flatpak $ sudo apt update $ sudo apt install flatpak
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Install the Software Flatpak plugin
The Flatpak plugin for the Software app makes it possible to install apps without needing the command line. To install, run:
$ sudo apt install gnome-software-plugin-flatpak
Note: the Software app is distributed as a Snap since Ubuntu 20.04 and does not support graphical installation of Flatpak apps. Installing the Flatpak plugin will also install a deb version of Software and result in two Software apps being installed at the same time.
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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://flathub.org/repo/flathub.flatpakrepo
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Restart
To complete setup, restart your system. Now all you have to do is !