cudf-tools software package provides command line tools for package upgrade problem descriptions, 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 cudf-tools
cudf-tools is installed in your system.
Make ensure the cudf-tools package were installed using the commands given below,
$ sudo dpkg-query -l | grep cudf-tools *
You will get with cudf-tools package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | cudf-tools |
| Version | 0.7-2+b4 [s390x], 0.7-2+b3 [am |
| Description | command line tools for package upgrade problem descriptions |
| Sub Section | devel |