fontconfig segmentation fault during package installation

[Davi Medrade]

During update, while doing post-install processing, apt-get reports that the process died with a SIGSEGV, and /var/log/fontconfig.log has only one line: "Segmentation fault (core dumped)".

I realize that this is not enough information, but I don't know what other information would be relevant (and/or how to obtain it), so I'd appreciate it if anyone could tell me what other information about my system or what other logs I need to add.

A few days earlier, I had a problem where I couldn't log in, and it turned out to be a segfault in libfreetype.so. After I had copied several fonts from a Windows partition, fc-cache crashed and that seems to be what caused the segfaults in FreeType. I realized that the fonts I copied from the Windows partition had permissions 640, so they weren't readable when I ran fc-cache from my regular user account. After I chmod'ed them to 644 and ran fc-cache, the FreeType segfaults stopped and I was able to log back into X, but ever since then, whenever I try to update fontconfig, it segfaults in the post-install step and apt-get reports one package "not fully installed" (or something to that effect).

I don't know if both problems are related. I just mentioned the fc-cache/libfreetype issue because it seemed odd to me that two font-related packages would start segfaulting within days of each other.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: fontconfig 2.11.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.12.0-5.13-generic 3.12.2
Uname: Linux 3.12.0-5-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.12.7-0ubuntu1
Architecture: i386
CurrentDesktop: Unity
Date: Tue Dec 10 09:12:19 2013
InstallationDate: Installed on 2013-12-01 (9 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20131130)
SourcePackage: fontconfig
UpgradeStatus: No upgrade log present (probably fresh install)

[Davi Medrade (davimedrade)]

Now I can't do an apt-get dist-upgrade because new packages that depend on fontconfig don't install due to apt not being able to finish setting it up.

For example:

dpkg: dependency problems prevent configuration of libpango-1.0-0:i386:
 libpango-1.0-0:i386 depends on fontconfig (>= 2.1.91); however:
  Package fontconfig is not configured yet.

dpkg: error processing libpango-1.0-0:i386 (--configure):
 dependency problems - leaving unconfigured

[niv (nivw2008)]

To solve this error when upgrading 14.04->14.10 I ran:
$ dpkg -D40 -i ~/Downloads/fontconfig_2.11.0-0ubuntu4.1_amd64.deb
Then I notice this file caused the error, so I seek the packge owning it:
$ dpkg -S /usr/share/fonts/truetype/unfonts-core/UnBatangBold.ttf
I then remove that package:
$ sudo apt-get remove fonts-unfonts-core
I know resume the pakcages install:
$ sudo apt-get install -f

which works ok now.