apertium-nor-dan software package provides virtual package provided by apertium-dan-nor, 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-nor-dan
apertium-nor-dan is installed in your system.
Make ensure the apertium-nor-dan package were installed using the commands given below,
$ sudo dpkg-query -l | grep apertium-nor-dan*
You will get with apertium-nor-dan package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Virtual packages |
| Package | apertium-nor-dan |
| Version | |
| Description | virtual package provided by apertium-dan-nor |
| Sub Section | Virtual |