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[Thorsten <thorstenr_42@xxxxxxxxxx>]

Does this bug also occur if there are no embedded fonts in a pdf? Because my canon scanner seems to produce pdfs  without embedded fonts, at least pdffonts shows no fonts:
$ pdffonts SCN_0002.pdf 
name                                 type              encoding         emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------

 and i get a very similar error when trying to minimize the filesize
with ghostscript:

$ gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/printer  -sOutputFile=out.pdf SCN_0002.pdf 
GPL Ghostscript 9.16 (2015-03-30)
Copyright (C) 2015 Artifex Software, Inc.  All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Processing pages 1 through 1.
Page 1
   **** Error reading a content stream. The page may be incomplete.
   **** File did not complete the page properly and may be damaged.

   **** This file had errors that were repaired or ignored.
   **** The file was produced by: 
   **** >>>> MP540 series <<<<
   **** Please notify the author of the software that produced this
   **** file that it does not conform to Adobe's published PDF
   **** specification.

With the minimal gs version from
http://www.ghostscript.com/download/gsdnld.html its working flawlessly.

i attached a pdf created by my scanner to this comment.

(i m using ubuntu 15.10)


** Attachment added: "SCN_0002.pdf"
   https://bugs.launchpad.net/ubuntu/+source/poppler-data/+bug/1438494/+attachment/4532873/+files/SCN_0002.pdf

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https://bugs.launchpad.net/bugs/1438494

Title:
  ghostscript fails to correctly substitute cidf fonts

Status in poppler-data package in Ubuntu:
  Triaged

Bug description:
  I reported this bug first with ghostscript
  (http://bugs.ghostscript.com/show_bug.cgi?id=695874), but it is
  apparently a packaging issue.

  The general issue is that when there is a CIDF font in a .pdf that is
  not embedded in the document, ghostscript will stop processing the
  file at that font (see the file attached to the ghostscript bug).  The
  packaging issue is that CIDF fonts that are not on the system are in
  the default Ubuntu cidfmap file.

  System info is:

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 14.10
  Release:        14.10
  Codename:       utopic

  $ ghostscript --version
  9.14

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