afterstep software package provides window manager with the NEXTSTEP look and feel, 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 afterstep
afterstep is installed in your system.
Make ensure the afterstep package were installed using the commands given below,
$ sudo dpkg-query -l | grep afterstep *
You will get with afterstep package name, version, architecture and description in a table
| Distro | Ubuntu 17 |
| Section | X Window System software |
| Package | afterstep |
| Version | 2.2.12-8 |
| Description | window manager with the NEXTSTEP look and feel |
| Sub Section | x11 |