$ sudo apt-get update
$ sudo apt-get install cl-sql-postgresql-socket 

cl-sql-postgresql-socket is installed in your system.

Make ensure the cl-sql-postgresql-socket package were installed using the commands given below,

$ sudo dpkg-query -l | grep cl-sql-postgresql-socket *

You will get with cl-sql-postgresql-socket package name, version, architecture and description in a table

cl-sql-postgresql-socket package basic information: