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.