You can uninstall or removes an installed moon-lander package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove moon-lander
If you would like to remove moon-lander and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove moon-lander
If you use with purge options to moon-lander package all the configuration and dependent packages will be removed.
$ sudo apt-get purge moon-lander
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 moon-lander