Having done further testing it seems that the bug is worse than
originally reported: in Ubuntu 13.04 the pango-graphite package only
works with certain fonts. I can't work out what the difference is
between those that work and those that don't. I did some comparison
between Linux distributions (Lubuntu, Xubuntu, Linux Mint XFCE, and
Linux Mint), and have attached screenshots of the most important
results.

Key points:
- Of the distributions tested, Linux Mint XFCE and Linux Mint were the only 
ones in which pango-graphite behaved exactly as expected. The Ubuntu 
derivatives were all affected by the UI font problem. (Odd given that Mint 
itself is based on Ubuntu.)
- In Lubuntu and Xubuntu the pango-graphite package worked properly with all 
fonts tested, but changed the UI font. Therefore it is only in Ubuntu that 
pango-graphite fails to work for all Graphite fonts equally.
- In the Ubuntu screenshots the LibreOffice window is given for comparison. 
Conakry displayed correctly in gedit and Inkscape with pango-graphite 
installed, but Miao Unicode did not.
- In Lubuntu the UI font (and even the monospace font in leafpad) changed from 
the Ubuntu font to Miao Unicode, whereas in Xubuntu it changed from the Ubuntu 
font to some nondescript fallback sans.

In order to replicate these tests I have attached the .txt, .svg, and
.odt files. (In gedit DeJaVu Sans will take precendence for the N’ko
script over Conakry, which is why I changed the overall gedit font to
Conakry for the Ubuntu screenshots. On the live sessions I simply
disabled DeJaVu.)

The fonts can be found here:
https://github.com/phjamr/MiaoUnicode/blob/master/MiaoUnicode-Regular.ttf
http://www.evertype.com/fonts/nko/ (also the source of the N’ko sample text)

** Attachment added: "Archive containing screenshots and test files"
   
https://bugs.launchpad.net/ubuntu/+source/pango-graphite/+bug/1176022/+attachment/3687850/+files/Pango-Graphite_Bug_Screenshots_TestFiles.zip

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https://bugs.launchpad.net/bugs/1176022

Title:
  Pango-graphite changes default UI font in Ubuntu 13.04

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