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