ALT Linux
Install Flatpak
To install Flatpak on operating systems of the Alt family, open the Terminal app and run:
su - apt-get update apt-get install flatpakAdd the Flathub repository
Flathub is a great place to get Flatpak apps. To enable it on your Alt system, run:
su - apt-get update apt-get install flatpak-repo-flathubRestart
Restart your device to complete the Flatpak installation. Now you can install apps!