cupt software package provides flexible package manager -- console interface, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install cupt
cupt is installed in your system.
Make ensure the cupt package were installed using the commands given below,
$ sudo dpkg-query -l | grep cupt *
You will get with cupt package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | cupt |
| Version | 2.8.4 |
| Description | flexible package manager -- console interface |
| Sub Section | admin |