nginx in ubuntu (trusty) 14.04

[Jeroen Ooms]

After upgrading my stack Apache2-Nginx Ubuntu stack to Ubuntu 14.04
beta, I am getting these errors in /var/log/nginx/error.log

2014/03/13 16:11:01 [emerg] 14625#0: bind() to 0.0.0.0:80 failed (98:
Address already in use)
2014/03/13 16:11:01 [emerg] 14625#0: bind() to [::]:80 failed (98:
Address already in use)
2014/03/13 16:11:01 [emerg] 14625#0: bind() to 0.0.0.0:80 failed (98:
Address already in use)
2014/03/13 16:11:01 [emerg] 14625#0: bind() to [::]:80 failed (98:
Address already in use)
2014/03/13 16:11:01 [emerg] 14625#0: still could not bind()

However the strange thing is that the default configuration of nginx
on Ubuntu does not include any sites running on port 80 (because
Apache uses this port). In previous versions of Ubuntu I have never
seen these messages. So I don't quite understand where these errors
are coming from.

Anyone familiar with the nginx package in Ubuntu can explain?