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root@ubuntu-s-1vcpu-1gb-lon1-01:/etc/nginx/sites-available# sudo certbot --nginx -d dataanalyst.gr -d www.dataanalyst.gr
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for dataanalyst.gr
http-01 challenge for www.dataanalyst.gr
nginx: [warn] conflicting server name "dataanalyst.gr" on 0.0.0.0:80, ignored
nginx: [warn] conflicting server name "www.dataanalyst.gr" on 0.0.0.0:80, ignored
nginx: [warn] conflicting server name "dataanalyst.gr" on [::]:80, ignored
nginx: [warn] conflicting server name "www.dataanalyst.gr" on [::]:80, ignored
Waiting for verification...
Cleaning up challenges
nginx: [warn] conflicting server name "dataanalyst.gr" on 0.0.0.0:80, ignored
nginx: [warn] conflicting server name "www.dataanalyst.gr" on 0.0.0.0:80, ignored
nginx: [warn] conflicting server name "dataanalyst.gr" on [::]:80, ignored
nginx: [warn] conflicting server name "www.dataanalyst.gr" on [::]:80, ignored
Failed authorization procedure. dataanalyst.gr (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://dataanalyst.gr/.well-known/acme-challenge/eO67Fns2LloRdvVd52HgcZt6EglmFHr0XQcrg8Lb_qg [159.65.89.237]: "<html>\r\n<head><title>404 Not Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404 Not Found</h1></center>\r\n<hr><center>", www.dataanalyst.gr (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://www.dataanalyst.gr/.well-known/acme-challenge/lZx-ElynPvtXR2PjB77nn5lmfqsAoORIKHAprUezUJc [159.65.89.237]: "<html>\r\n<head><title>404 Not Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404 Not Found</h1></center>\r\n<hr><center>"

IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: dataanalyst.gr
   Type:   unauthorized
   Detail: Invalid response from
   http://dataanalyst.gr/.well-known/acme-challenge/eO67Fns2LloRdvVd52HgcZt6EglmFHr0XQcrg8Lb_qg
   [159.65.89.237]: "<html>\r\n<head><title>404 Not
   Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404
   Not Found</h1></center>\r\n<hr><center>"

   Domain: www.dataanalyst.gr
   Type:   unauthorized
   Detail: Invalid response from
   http://www.dataanalyst.gr/.well-known/acme-challenge/lZx-ElynPvtXR2PjB77nn5lmfqsAoORIKHAprUezUJc
   [159.65.89.237]: "<html>\r\n<head><title>404 Not
   Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404
   Not Found</h1></center>\r\n<hr><center>"

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address.