libmono-corlib2.1-cil 2.0.1-6ubuntu1 (i386 binary) in ubuntu karmic

 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 CLR (Common Language Runtime) including compiler and
 runtime, which can produce and execute CIL (Common Intermediate Language)
 bytecode (aka assemblies), and a class library.
 .
 This package contains the Core Library (mscorlib.dll) of Mono for CLI 2.1
 (Silverlight/Moonlight), which is the glue between the BCL (Base Class
 Libraries) and the JIT.