Binary package “libfontconfig1-dbg” in ubuntu lucid

generic font configuration library - debugging symbols

 Fontconfig is a font configuration and customization library, which
 does not depend on the X Window System. It is designed to locate
 fonts within the system and select them according to requirements
 specified by applications.
 .
 This package contains the debugging symbols associated with
 libfontconfig1. They will automatically be used by gdb for debugging
 fontconfig-related issues. It should be installed when experiencing crashes
 involving fontconfig so that a better backtrace is provided in
 the bug report.