You can uninstall or removes an installed info-beamer package itself from Ubuntu 16.04 LTS (Xenial Xerus) through the terminal,
$ sudo apt-get remove info-beamer
If you would like to remove info-beamer and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove info-beamer
If you use with purge options to info-beamer package all the configuration and dependent packages will be removed.
$ sudo apt-get purge info-beamer
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 info-beamer