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