apertium-sv-da software package provides virtual package provided by apertium-swe-dan, 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-sv-da
apertium-sv-da is installed in your system.
Make ensure the apertium-sv-da package were installed using the commands given below,
$ sudo dpkg-query -l | grep apertium-sv-da*
You will get with apertium-sv-da package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Virtual packages |
| Package | apertium-sv-da |
| Version | |
| Description | virtual package provided by apertium-swe-dan |
| Sub Section | Virtual |