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W [19/Feb/2021:18:42:14 +0100] [Job 18] Grayscale/monochrome printing requested for this job but Poppler is not able to convert to grayscale/monochrome PostScript.W [19/Feb/2021:18:42:14 +0100] [Job 18] Use \"pdftops-renderer\" option (see cups-filters README file) to use Ghostscript or MuPDF for the PDF -> PostScript conversion.
lpadmin -p <printername> -o pdftops-renderer-default=gs