To uninstall education-desktop-xfce just follow these instructions.
sudo apt-get remove education-desktop-xfce
This will remove just the education-desktop-xfce package itself.
sudo apt-get remove --auto-remove education-desktop-xfce
This will remove the education-desktop-xfce package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for education-desktop-xfce then this will work.
sudo apt-get purge education-desktop-xfce
Or similarly, like this education-desktop-xfce
sudo apt-get purge --auto-remove education-desktop-xfce
|Maintainer||Debian Edu Developers <email@example.com>|
|Description||Debian Edu Xfce desktop applications|