libgtk2.0-0-dbg 2.8.9-2ubuntu2 (amd64 binary) in ubuntu dapper

The GTK+ libraries and debugging symbols
 The GTK+ is a multi-platform toolkit for creating graphical user
 interfaces. Offering a complete set of widgets, the GTK+ is suitable
 for projects ranging from small one-off tools to complete application
 suites.
 .
 This package contains unstripped shared libraries. it is provided
 primarily to provide a backtrace with names in a debugger, this makes
 it somewhat easier to interpret core dumps. The libraries are installed
 in /usr/lib/debug and can be used by placing that directory in
 LD_LIBRARY_PATH.
 Most people will not need this package.