To use Flatpak, you need to set it up once per system:
1. Install Flatpak: sudo apt install flatpak
sudo apt install flatpak
2. Add Flathub: flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
3. Restart your system to complete setup