apertium-nno software package provides Apertium single language data for Norwegian Nynorsk, 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 apertium-nno
apertium-nno is installed in your system.
Make ensure the apertium-nno package were installed using the commands given below,
$ sudo dpkg-query -l | grep apertium-nno *
You will get with apertium-nno package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Science |
| Package | apertium-nno |
| Version | 0.9.0~r69513-1 |
| Description | Apertium single language data for Norwegian Nynorsk |
| Sub Section | Science |