Thanks for the quick reply! I don't have the link to the older thread I was looking at, but I was following the rule of "do a search before asking a question", and found a series of exchanges between Calibre author Goyal and a user about the technical problems with such a conversion.
My specific situation is that I have access to some online textbooks, that allow printing but do not allow saving to disk. So, using the CUPS-PDF driver, I "print" the pages to a PDF file, which I would then like to convert to EPUB to read on my laptop/desktop/Droid. I could also print-to-disk as a PostScript file, but I suspect that wouldn't be much different from printing to PDF.
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