You can uninstall or removes an installed fat-modules-3.13.0-24-generic- package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove fat-modules-3.13.0-24-generic-
If you would like to remove fat-modules-3.13.0-24-generic- and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove fat-modules-3.13.0-24-generic-
If you use with purge options to fat-modules-3.13.0-24-generic- package all the configuration and dependent packages will be removed.
$ sudo apt-get purge fat-modules-3.13.0-24-generic-
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 fat-modules-3.13.0-24-generic-