You can uninstall or removes an installed gemrb package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove gemrb
If you would like to remove gemrb and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove gemrb
If you use with purge options to gemrb package all the configuration and dependent packages will be removed.
$ sudo apt-get purge gemrb
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 gemrb
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