libgnat-4.9 software package provides runtime for applications compiled with GNAT (shared library), you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libgnat-4.9
libgnat-4.9 is installed in your system.
Make ensure the libgnat-4.9 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgnat-4.9 *
You will get with libgnat-4.9 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Libraries |
| Package | libgnat-4.9 |
| Version | 4.9.3-3ubuntu5 |
| Description | runtime for applications compiled with GNAT (shared library) |
| Sub Section | Libs |