$ apt-cache policy libxapian22v5
libxapian22v5:
  Installed: 1.2.21-1.2
  Candidate: 1.2.21-1.2
  Version table:
 *** 1.2.21-1.2 500
        500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status