$ apt-cache policy php7.0-intl
php7.0-intl:
  Installed: (none)
  Candidate: 7.0.25-1+ubuntu16.04.1+deb.sury.org+1
  Version table:
     7.0.25-1+ubuntu16.04.1+deb.sury.org+1 501
        501 http://ppa.launchpad.net/ondrej/php/ubuntu xenial/main amd64 Packages
     7.0.22-0ubuntu0.16.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
        500 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages
     7.0.4-7ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages