aptdaemon software package provides transaction based package management service, 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 aptdaemon
aptdaemon is installed in your system.
Make ensure the aptdaemon package were installed using the commands given below,
$ sudo dpkg-query -l | grep aptdaemon *
You will get with aptdaemon package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | aptdaemon |
| Version | 1.1.1-4+deb8u1 |
| Description | transaction based package management service |
| Sub Section | admin |