Some remarks:

- This problem only occurs if Ghostscript is fed with PDF. This is the
case for current Ubuntu and Debian distributions, as they use a PDF-
based printing workflow (CUPS turns incoming data to PDF, pre-processes
the PDF (N-up, selected pages, ...), and sends PDF to the
Ghostscript/driver process). Other distributions or older Ubuntu/Debian
versions feed only PostScript into Ghostscript and then this problem
does not occur.

- The mentioned changes in CUPS' mime.convs change the workflow of CUPS
to be PostScript-based, eliminating feeding of PDF into Ghostscript.
This makes the problem disappear.

- CUPS accepts .types and .convs files not only in /etc/cups/ but also
in /usr/share/cups/mime/. The latter was introduced as the Debian
p[ackaging system considers everything in /etc/ as config files. This
makes package updates work more reliably. For personal changes create
.types and .convs files in /etc/cups. Rules in the files in /etc/cups
have priority against rules for the same purpose in files in
/usr/share/cups/mime/.

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https://bugs.launchpad.net/bugs/321932

Title:
  Ghostscript does not render when ttf-mscorefonts-installer is
  installed

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