Procedure
Install Flatpak and enable Flathub on Linux
Install Flatpak if needed, add the Flathub remote, optionally note Snap on Ubuntu, then verify with flatpak --version.
Step 1
Install Flatpak if missing. Ubuntu/Debian (elevated): apt install flatpak . Fedora Workstation usually already has Flatpak.
Step 2
Add Flathub per https://flathub.org/setup : flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo . On Ubuntu you may also install snapd via apt if you want Snap apps: apt install snapd
Step 3
flatpak --version
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