This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu4
--------------- isc-dhcp (4.3.5-3ubuntu4) bionic; urgency=medium
* dhclient-script.linux: handle empty case also when waiting for ipv6 link local DAD. (LP: #1718568)
-- Dan Streetman <email address hidden> Thu, 12 Oct 2017 08:48:06 -0400
This bug was fixed in the package isc-dhcp - 4.3.5-3ubuntu4
---------------
isc-dhcp (4.3.5-3ubuntu4) bionic; urgency=medium
* dhclient- script. linux: handle empty case also when waiting for ipv6 link
local DAD. (LP: #1718568)
-- Dan Streetman <email address hidden> Thu, 12 Oct 2017 08:48:06 -0400