creating a configuration file symbolic link
sudo ln -s /etc/apache2/sites-available/default-ssl.conf /etc/apache2/sites-enabled/000-default-ssl.conf
add this to 000-default-le-ssl.conf
ServerName example.com
ServerAlias www.example.com
https://community.letsencrypt.org/t/cant-renew-certificate-we-were-unable-to-find-a-vhost-with-a-servername-or-address/11675/2
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