$ sudo apt-cache policy meson
meson:
  Installed: 0.29.0-1
  Candidate: 0.29.0-1
  Version table:
     0.40.1-1~ubuntu16.04.1 100
        100 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages
 *** 0.29.0-1 500
        500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status