[Bug 1326188] Re: Wrong PDF standard fonts are replaced when fonts package "fonts-texgyre" is installed - PDFs are rendered with missing characters

[madbiologist]

This is fixed on Utopic in fontconfig 2.11.1-0ubuntu3 and on Trusty in
fontconfig 2.11.0-0ubuntu4.1

the Trusty changelog says:

  * 0001-Bug-73291-poppler-does-not-show-fl-ligature.patch: Don't alias TeX
    Gyre Termes to Times as it has a broken 'fi' ligature. (LP: #1325230)
 -- Iain Lane <iain.lane at canonical.com>

Apparently people who upgrade from Trusty to Utopic are still affected
by this bug.

An even better fix is in poppler 0.28.1-1ubuntu1, which is currently
available in Ubuntu 15.04 "Vivid Vervet" development version.  As a
result of this fix, there are comments in an upstream bug for the
fontconfig changes to be reverted so as to restore normal behaviour to
LaTex and other packages that use the texgyre fonts.

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https://bugs.launchpad.net/bugs/1326188

Title:
  Wrong PDF standard fonts are replaced when fonts package "fonts-
  texgyre" is installed - PDFs are rendered with missing characters

Status in fontconfig package in Ubuntu:
  New

Bug description:
  Hi,

  
  please see following bug report on freedesktop with screenshots:
  https://bugs.freedesktop.org/show_bug.cgi?id=79527

  When fonts package "fonts-texgyre" from the "texgyre" package is installed,
  all PDFs containing e.g. a reference to a "Helvetica" font, which is usually not installed on Ubuntu systems, fontconfig mages a very bad choice with one of the fonts supplied in fonts-texgyre (like "TeX Gyre Heros").

  The problem is, apparantly the texgyre fonts us a different naming
  style for some important glyphs (like greek characters contained in
  many mathematical documents), so that fontconfig cannot find them.

  See screenshots in abovementioned bugreport: 
  ==> PDF readers only display a blank space in this case, which has potentially disastrous results (there are six orders of magnitude difference between an Ampere current and a Microampere current e.g..).

  There is a likely explanation also unter this bugreport:
  https://bugs.launchpad.net/ubuntu/+source/tex-gyre/+bug/1317599

  ==> Please change the Ubuntu font configuration so that all those PDFs
  are displayed correctly.

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