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