You can uninstall or removes an installed genus2reduction package itself from Debian 7 (Wheezy) through the terminal,
$ sudo apt-get remove genus2reduction
If you would like to remove genus2reduction and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove genus2reduction
If you use with purge options to genus2reduction package all the configuration and dependent packages will be removed.
$ sudo apt-get purge genus2reduction
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 genus2reduction