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<p>Resolved by installing Pithos from the file <b>pithos.flatpakref</b>
downloaded from <a href="http://flatpak.org/apps.html">http://flatpak.org/apps.html</a></p>
<p>It appears the instructions at <a
href="https://github.com/pithos/pithos/wiki/Flatpak">https://github.com/pithos/pithos/wiki/Flatpak</a>
are wrong</p>
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