Swap uses hard disk space memory (swap space) to store information from RAM and release some space from RAM.

Sometimes you need to grant permissions to someone else and maybe you don’t want to share the .pem file.

This may indicate a permissions problem with your WordPress uploads directory. Firstly please make sure that you have the right permissions on /uploads folder.

Zip or unzip files in Ubuntu, simple steps that you can reproduce. Find a simple way to handle zip files in Linux

In this tutorial, you’ll learn how to install and secure a LEMP server on Ubuntu or Debian. I used the following software versions, but most versions will be okay to use: Ubuntu 18.04 LTS, Nginx 1.14.0, MariaDB 15.1, PHP 7.2