Server configuration for WordPress - Do I need install PHP-SSH extensions for Wordpress on Fedora28?

Migrated from Stackoverflow Unix Linux:

Recently I tried to setup a Wordpress server on Fedora28 based droplet on Digital Ocean. A followed some tutorials and the result was the same: After a "successful" Wordpress installation I couldn't add new plugins etc. Followed some resolving methods(debug, tutorials etc.), I found that it could be something about the unsuccessful SSH connection between Wordpress app and Wordpress.org.

Then in a tutorial a read the following, which is for Ubuntu and for older version PHP, but I found intresting:

sudo apt-get update
sudo apt-get install php5-gd libssh2-php

This will allow you to work with images and will also allow you to install plugins and update portions of your site using your SSH login credentials.

My question is: Is there really something about some missing parts of php-ssh installation or I failed at some other part of configuring the LAMP/Wordpress environment?

Thank you!

Update:

I managed to find and installed the appropriate library for Fedora28: see how But the root of the problem has not been solved with it, since I have no add new plugin possibility in Wordpress dashboard still.