sudo  apt-cache policy libvpx1:amd64 libvpx1:i386
libvpx1:
  Installed: 1.3.0-3~trusty
  Candidate: 1.3.0-3~trusty
  Version table:
 *** 1.3.0-3~trusty 0
        100 /var/lib/dpkg/status
     1.3.0-2.1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ utopic/main amd64 Packages
libvpx1:i386:
  Installed: (none)
  Candidate: 1.3.0-2.1
  Version table:
     1.3.0-3~trusty 0
        100 /var/lib/dpkg/status
     1.3.0-2.1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ utopic/main i386 Packages