You can uninstall or removes an installed libga2 package itself from Ubuntu 17.04 (Zesty Zapus) through the terminal,
$ sudo apt-get remove libga2
If you would like to remove libga2 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libga2
If you use with purge options to libga2 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libga2
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove libga2
I'm very pleased to share my working experience in the Linux field and have posted articles in this website — bits and pieces learned throughout my career.
