How to uninstall or remove libfftw3-long3 software package from Ubuntu 14.04 LTS (Trusty Tahr)

You can uninstall or removes an installed libfftw3-long3 package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,

$ sudo apt-get remove libfftw3-long3

Uninstall libfftw3-long3 including dependent package

If you would like to remove libfftw3-long3 and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libfftw3-long3

Use Purging libfftw3-long3

If you use with purge options to libfftw3-long3 package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libfftw3-long3

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 libfftw3-long3