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If you have installed the nginx package from the Ubuntu repositories,
you will have two directories.
/etc/nginx/sites-enabled and /etc/nginx/sites-available.
In the main nginx configuration, /etc/nginx/nginx.conf,
you have the following line:
include /etc/nginx/sites-enabled/*.conf;
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sudo ln -s /etc/nginx/sites-available/example.com /etc/nginx/sites-enabled/