You can uninstall or removes an installed libfastjetplugins0 package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove libfastjetplugins0
If you would like to remove libfastjetplugins0 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libfastjetplugins0
If you use with purge options to libfastjetplugins0 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libfastjetplugins0
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 libfastjetplugins0