You can uninstall or removes an installed kubuntu-low-fat-settings package itself from Ubuntu 12.04 LTS (Precise Pangolin) through the terminal,
$ sudo apt-get remove kubuntu-low-fat-settings
If you would like to remove kubuntu-low-fat-settings and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove kubuntu-low-fat-settings
If you use with purge options to kubuntu-low-fat-settings package all the configuration and dependent packages will be removed.
$ sudo apt-get purge kubuntu-low-fat-settings
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 kubuntu-low-fat-settings