@lina.w - I've also never needed to convert epub to pdf.
But if I did and I couldn't get a satisfactory result out of direct conversion then I would probably consider the option of getting the text into a word processor like Word or Writer via a conversion to HTMLZ. There are lots of options available for converting wp formats to PDF. The save (export ?) as PDF in Writer is pretty good, I've used it make PDF's that were used in offset printing.
BR
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