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