faisal@faisal-thinkpad-x220:~$ apt-cache policy mutter-common
mutter-common:
  Installed: 3.20.2-1ubuntu1~yxenial1
  Candidate: 3.20.2-1ubuntu1~yxenial1
  Version table:
 *** 3.20.2-1ubuntu1~yxenial1 100
        100 /var/lib/dpkg/status
     3.18.3-0ubuntu2 500
        500 http://kw.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
        500 http://kw.archive.ubuntu.com/ubuntu xenial/universe i386 Packages
faisal@faisal-thinkpad-x220:~$