greenwich software package provides graphical whois client for GNOME, you can install in your Ubuntu 17.04 (Zesty Zapus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install greenwich
greenwich is installed in your system.
Make ensure the greenwich package were installed using the commands given below,
$ sudo dpkg-query -l | grep greenwich *
You will get with greenwich package name, version, architecture and description in a table
| Distro | Ubuntu 17 04 zesty zapus |
| Section | GNOME |
| Package | greenwich |
| Version | 0.8.2-6 |
| Description | graphical whois client for GNOME |
| Sub Section | GNOME |