This blog post will show you how to install Let’s Encrypt SSL certificate on Ubuntu 26.04 on your domain, for free. Let’s Encrypt is a free, automated certificate authority (CA) run by the non-profit Security Research Group. Let’s Encrypt provides free SSL/TLS certificates to enable HTTPS on websites. The Free Let’s Encrypt SSL certificate is valid for 90 days and must be renewed, manually or automatically, using Certbot before it expires.
In the following paragraphs, we will explain in more detail the Certbot tool, the ACME provider, and their relationship with Let’s Encrypt. Then we will show you how to install a Free Let’s Encrypt SSL certificate using Nginx and Apache as web servers. Let’s get things done!