Public bug reported:

When using Ubuntu (in this case the live 16.04.1 LTS ISO) as a
Generation 2 (Gen1 untested) Hyper-V VM, an IPv6 address can't be gotten
through DHCPv6. dhclient continues to send out solicitations but they
never result in a response. I've looked on the router end (running
AdvancedTomato and dnsmasq) and the router is getting the requests and
is sending out a advertisement, but the VM never gets it. Using the
exact same live ISO works in VirtualBox so I've convinced it is an issue
with the Hyper-V network driver or something along those lines.

The only IPv6 address that is configured automatically is the fe80 link-
local address.

Windows VMs and older Linux VMs (Debian jessie with 3.16 kernel) work
just fine and receive an IPv6 via DHCPv6.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-31-generic 4.4.0-31.50
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
CasperVersion: 1.376
CurrentDesktop: Unity
Date: Sat Sep 17 19:56:42 2016
 lo        no wireless extensions.
 eth0      no wireless extensions.
LiveMediaBuild: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: Microsoft Corporation Virtual Machine
 PATH=(custom, no user)
ProcFB: 0 hyperv_fb
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi 
file=/cdrom/preseed/username.seed boot=casper quiet splash ---
 linux-restricted-modules-4.4.0-31-generic N/A
 linux-backports-modules-4.4.0-31-generic  N/A
 linux-firmware                            1.157.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install) 11/26/2012
dmi.bios.vendor: Microsoft Corporation
dmi.bios.version: Hyper-V UEFI Release v1.0
dmi.board.asset.tag: None Virtual Machine
dmi.board.vendor: Microsoft Corporation
dmi.board.version: Hyper-V UEFI Release v1.0
dmi.chassis.asset.tag: 5808-9631-9266-5991-2472-7695-55
dmi.chassis.type: 3
dmi.chassis.vendor: Microsoft Corporation
dmi.chassis.version: Hyper-V UEFI Release v1.0
dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev1.0:bd11/26/2012:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev1.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev1.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev1.0: Virtual Machine
dmi.product.version: Hyper-V UEFI Release v1.0
dmi.sys.vendor: Microsoft Corporation

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug xenial

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  DHCPv6 does not work in Hyper-V

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