It’s a pity that an Emacs user like you or Tsoding cannot use Ada in your editor. Since there’s Ada code to compile to make the ada-mode work, it is not so easy to install as other pure Elisp packages. Nevertheless, installing the last version for me was mostly straightforward using Alire.
I wanted to try it again from scratch (clean user account) to see which are the rough points, and it failed indeed. The problem is the same already analyzed here: Gprconfig: can't find native toolchain for language 'ada' - #7 by nerd_type
So I’ll write there about this problem.