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

[Tom Fields]

Public bug reported:

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.

** Affects: fontconfig (Ubuntu)
     Importance: Undecided
         Status: New

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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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