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[Updated] How to Secure Apache with Free Let’s Encrypt SSL Certificate on Ubuntu and Debian

You have a newly registered domain name and your web server operates with a SSL Self-Signed Certificate issued by you which is causing headaches for your clients while they visit the domain due to certificate’s generated errors? You have a limited budget and you can’t afford to buy a certificate issued by a trusted CA? This is when Let’s Encrypt software comes into scene and saves the day.