gnuplot5-x11 software package provides Command-line driven interactive plotting program. X-package, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gnuplot5-x11
gnuplot5-x11 is installed in your system.
Make ensure the gnuplot5-x11 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnuplot5-x11 *
You will get with gnuplot5-x11 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Mathematics |
| Package | gnuplot5-x11 |
| Version | 5.0.0~rc+dfsg2-1 |
| Description | Command-line driven interactive plotting program. X-package |
| Sub Section | Math |