Why can’t I connect to PostgreSQL separate DB connection?
By Aleksandar Vukovic on 05/11/19

If your PostgreSQL is installed on Ubuntu 18.04 server, and you’re receiving the following error:

“wpDataTables could not connect to postgresql server. postgresql said: There was a problem with your SQL connection – could not find driver”

You may need to install PGSQL driver by following these steps:

[sudo] apt-get install php-pgsql

Then uncomment pgsql and pdo-pgsql extentions in php.ini and restart Apache with the following command:

[sudo] /etc/init.d/apache2 restart