Comment 4 for bug 1214385

root@ale:~# apt-cache policy isc-dhcp-client
isc-dhcp-client:
  Installed: 4.1.ESV-R4-0ubuntu5.8
  Candidate: 4.1.ESV-R4-0ubuntu5.8
  Version table:
     4.1.ESV-R4-0ubuntu5.9 0
        400 http://ubuntu-precise.mirror.corp.google.com/ubuntu/ precise-proposed/main amd64 Packages
 *** 4.1.ESV-R4-0ubuntu5.8 0
        600 https://rapture-prod.corp.google.com/ ubuntu-precise-base/main amd64 Packages
        100 /var/lib/dpkg/status
root@ale:~# tail -n 5 /etc/network/interfaces
auto eth0
iface eth0 inet manual
iface eth0 inet6 auto
 dhcp 1

root@ale:~# ifdown eth0; ifup eth0
ifdown: interface eth0 not configured
net.ipv6.conf.eth0.accept_ra = 1
net.ipv6.conf.eth0.autoconf = 1
root@ale:~# grep nameserver /etc/resolv.conf
nameserver 172.16.xxx.xxx
root@ale:~# apt-get install isc-dhcp-client=4.1.ESV-R4-0ubuntu5.9 isc-dhcp-common=4.1.ESV-R4-0ubuntu5.9
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  resolvconf avahi-autoipd
The following packages will be upgraded:
  isc-dhcp-client isc-dhcp-common
2 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 0 B/637 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 225378 files and directories currently installed.)
Preparing to replace isc-dhcp-client 4.1.ESV-R4-0ubuntu5.8 (using .../isc-dhcp-client_4.1.ESV-R4-0ubuntu5.9_amd64.deb) ...
Unpacking replacement isc-dhcp-client ...
Preparing to replace isc-dhcp-common 4.1.ESV-R4-0ubuntu5.8 (using .../isc-dhcp-common_4.1.ESV-R4-0ubuntu5.9_amd64.deb) ...
Unpacking replacement isc-dhcp-common ...
Processing triggers for man-db ...
Setting up isc-dhcp-common (4.1.ESV-R4-0ubuntu5.9) ...
Setting up isc-dhcp-client (4.1.ESV-R4-0ubuntu5.9) ...
root@ale:~# ifdown eth0; ifup eth0
Sleeping for 338 seconds ...
net.ipv6.conf.eth0.accept_ra = 1
net.ipv6.conf.eth0.autoconf = 1
root@ale:~# grep nameserver /etc/resolv.conf
nameserver 2401:xxxx:xxxx::53

(IP addresses edited out.) Works for me.