nginx:
  Installed: (none)
  Candidate: 1.7.3-1~trusty
  Version table:
     1.7.3-1~trusty 0
        500 http://nginx.org/packages/mainline/ubuntu/ trusty/nginx amd64 Packages
     1.4.6-1ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages