flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo"
Souce: flatpak/flatpak#2147 (comment)
cd /var/lib
sudo cp -R flatpak /media/data/
sudo ln -s /media/data/flatpak flatpak
flatpak search ferdium
flatpak list
flatpak list --all
flatpak uninstall lyx
# update specific software
flatpak update lyx
# update all software from upstream repo
flatpak update --appstream
# update all installed software
flatpak update