To have a system that you don't have to rely on me (or someone else) to help you update/modify in the future, I would go the ppa route I described above. That way, system package installing/updating procedures will still function normally.
This kind of stuff not being your forte is sort of why I suggested the path I did. We can go the other route, but it will be more involved, and future updates to Sigil won't be integrated into your normal system update procedures.
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