Це стара версія документу!
This is outdated. Officially it's recommended to use system-wide Flatpak, without –user: https://docs.flatpak.org/en/latest/using-flatpak.html#system-versus-user
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Do not use sudo, better use userwide flatpak installation
flatpak --user search octave
flatpak --user install flathub org.octave.Octave
flatpak --user list
flatpak --user update