convert english+greek emacs file to pdf

["Russell L. Harris" <russell@rlharris.org>]

I am running Debian 9.11 with a HP Laserjet P3015 Postscript.  By
means of rodent-cut-and-paste from a web page, I have on the emacs
screen a file with a combination of English and Greek characters.  But
I need a paper copy.  

FILE -> PRINT POSTSCRIPT BUFFER renders the Greek characters as
question marks.  But a PDF file with a mixture of English and Greek
characters prints properly on the HP3015.

I loaded the file into LibreOffice Writer, hoping to export PDF, but
LibreOffice Writer does not display the Greek properly.