akonadi-backend-postgresql software package provides PostgreSQL storage backend for Akonadi, 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 akonadi-backend-postgresql
akonadi-backend-postgresql is installed in your system.
Make ensure the akonadi-backend-postgresql package were installed using the commands given below,
$ sudo dpkg-query -l | grep akonadi-backend-postgresql *
You will get with akonadi-backend-postgresql package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Miscellaneous |
| Package | akonadi-backend-postgresql |
| Version | 4:16.04.3-2 |
| Description | PostgreSQL storage backend for Akonadi |
| Sub Section | Miscellaneous |
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