gnat-mingw-w64 software package provides GNU Ada compiler for MinGW-w64, 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 gnat-mingw-w64
gnat-mingw-w64 is installed in your system.
Make ensure the gnat-mingw-w64 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnat-mingw-w64 *
You will get with gnat-mingw-w64 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Development |
| Package | gnat-mingw-w64 |
| Version | 5.3.1-3ubuntu1+16 |
| Description | GNU Ada compiler for MinGW-w64 |
| Sub Section | Devel |