apt-cache policy libgomp1
libgomp1:
  Installed: 5.3.1-14ubuntu2.1
  Candidate: 5.4.0-6ubuntu1~16.04.1
  Version table:
     5.4.0-6ubuntu1~16.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
 *** 5.3.1-14ubuntu2.1 500
        500 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.3.1-14ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages