libmono-corlib4.5-dll 6.8.0.105+dfsg-3.2 (amd64 binary) in ubuntu impish

 Mono is a platform for running and developing applications based on the
 ECMA/ISO Standards. Mono is an open source effort led by Xamarin.
 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 4.5,
 which is the glue between the BCL (Base Class Libraries) and the JIT.
 .
 This package contains only mscorlib.dll without a mono-runtime dependency
 to avoid a dependency cycle between the mono core components. For all other
 uses you should install libmono-corlib4.5-cil instead.