This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu16
--------------- isc-dhcp (4.3.3-5ubuntu16) zesty; urgency=medium
* ipv6: wait for duplicate address detection to finish (LP: #1633479).
-- Scott Moser <email address hidden> Thu, 20 Oct 2016 12:55:33 -0400
This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu16
---------------
isc-dhcp (4.3.3-5ubuntu16) zesty; urgency=medium
* ipv6: wait for duplicate address detection to finish (LP: #1633479).
-- Scott Moser <email address hidden> Thu, 20 Oct 2016 12:55:33 -0400