I am able to visit 127.0.0.1. When visiting localhost, it is not able to resolve.
Here is /etc/hosts
127.0.0.1 localhost # suppose to list all folder + files under /var/www, when visit localhost. 127.0.0.1 mymachine # aegir 127.0.0.1 languages.local #drupal 127.0.0.1 languages.localhost #drupal -- The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters