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  1. Install Flatpak

    A flatpak package is available in Debian 10 (Buster) and newer. To install it, run the following as root:

    apt install flatpak
  2. Install the Software Flatpak plugin

    If you are running GNOME, it is also a good idea to install the Flatpak plugin for GNOME Software. To do this, run:

    apt install gnome-software-plugin-flatpak

    If you are running KDE, you should instead install the Plasma Discover Flatpak backend:

    apt install plasma-discover-backend-flatpak
  3. Add the Flathub repository

    Flathub is the best place to get Flatpak apps. To enable it, download and install the Flathub repository file or run the following in a terminal:

    flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
  4. Restart

    To complete setup, restart your system. Now all you have to do is install some apps!