$ sudo apt-get update
$ sudo apt-get install gnustep-dl2-postgresql-adaptor

gnustep-dl2-postgresql-adaptor is installed in your system.

Make ensure the gnustep-dl2-postgresql-adaptor package were installed using the commands given below,

$ sudo dpkg-query -l | grep gnustep-dl2-postgresql-adaptor*

You will get with gnustep-dl2-postgresql-adaptor package name, version, architecture and description in a table

gnustep-dl2-postgresql-adaptor package basic information: