apertium-srd software package provides Apertium single language data for Sardinian, 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-srd
apertium-srd is installed in your system.
Make ensure the apertium-srd package were installed using the commands given below,
$ sudo dpkg-query -l | grep apertium-srd *
You will get with apertium-srd package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Science |
| Package | apertium-srd |
| Version | 0.9.0~r72792-1 |
| Description | Apertium single language data for Sardinian |
| Sub Section | Science |