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*immaculate on any device that has Arial, unless your PDF conforms to PDF/A.

Linux machines don't normally include Arial due to the license, and only PDF/A includes the fonts used in the document.

By default an Arial clone is present, ideally Arial is specified as a valid replacement font in the PDF if the user does not have the Arial clone present (Arial itself is a clone, but that is another story). It would require deeper investigation to see if this is actually the case. I've always wondered about this.

PDF/A has given me all kinds of issues (windows users get incorrect glyp placement with very bad results). Regular PDF has worked fine for me.

nit: normal PDFs may embed fonts, but PDF/A must embed them, and PDF/A is not the default in most programs.

In practice however most programs seem to include fonts in exported PDFs?

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