inn2-lfs software package provides transitional dummy package, 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 inn2-lfs
inn2-lfs is installed in your system.
Make ensure the inn2-lfs package were installed using the commands given below,
$ sudo dpkg-query -l | grep inn2-lfs *
You will get with inn2-lfs package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Newsgroups |
| Package | inn2-lfs |
| Version | 2.6.0-2+b1 |
| Description | transitional dummy package |
| Sub Section | News |