acpi-support-base software package provides scripts for handling base ACPI events such as the power button, 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 acpi-support-base
acpi-support-base is installed in your system.
Make ensure the acpi-support-base package were installed using the commands given below,
$ sudo dpkg-query -l | grep acpi-support-base *
You will get with acpi-support-base package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | acpi-support-base |
| Version | 0.142-6 |
| Description | scripts for handling base ACPI events such as the power button |
| Sub Section | admin |