This bug was fixed in the package fontconfig - 2.12.6-0ubuntu1
---
fontconfig (2.12.6-0ubuntu1) bionic; urgency=medium
* Merge with Debian (LP: #1638959, LP: #1702544). Remaining changes:
- debian/source_fontconfig.py, debian/fontconfig.install:
+ Install apport hook
Thank you for taking the time to report this bug! This bug will be fixed
in Ubuntu 18.04 LTS.
** Changed in: fontconfig (Ubuntu)
Status: New => Fix Committed
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Correcting the above bug may introduce this issue:
https://bugs.freedesktop.org/show_bug.cgi?id=60748
that has been fixed by using target=pattern instead of target=font.
For example, the 10-antialias.conf file at the moment is:
?xml version=1.0?
!DOCTYPE fontconfig SYSTEM fonts.dtd
fontconfig