Binary package “libgnat-5-dbg” in ubuntu bionic

runtime for applications compiled with GNAT (debugging symbols)

 GNAT is a compiler for the Ada programming language. It produces optimized
 code on platforms supported by the GNU Compiler Collection (GCC).
 .
 The libgnat library provides runtime components needed by most
 applications produced with GNAT.
 .
 This package contains the debugging symbols.