mono-classlib-1.0-dbg 1.1.12-0ubuntu1 (amd64 binary) in ubuntu dapper

Mono class library (1.0) - debug symbols
 Mono is a platform for running and developing applications based on the
 ECMA/ISO Standards. Mono is an open source effort led by Novell.
 Mono provides a complete .NET CLR including compiler and runtime, which can
 produce and execute CIL bytecode (assemblies), and a .NET class library.
 .
 This package contains debug symbols (*.mdb) for Mono class library 1.0