We can’t restart Apache2 server after following the instructions to install a SSL certificate for a subdomain via Let’s Encrypt. (eg. subdomain.domian.co)
AH01574: module proxy_module is already loaded, skipping AH00548: NameVirtualHost has no effect and will be removed in the next release /etc/apache2/ports.conf:8 AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message Action 'start' failed. The Apache error log may have more information.
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