You can uninstall or removes an installed liballegro-video5.2 package itself from Ubuntu 17.04 (Zesty Zapus) through the terminal,
$ sudo apt-get remove liballegro-video5.2
If you would like to remove liballegro-video5.2 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove liballegro-video5.2
If you use with purge options to liballegro-video5.2 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge liballegro-video5.2
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 liballegro-video5.2