Public bug reported:

I have the weirdest network bug ever...

I'm using Gnome-desktop (not unity).
When configuring IPv6 in the network preferences, if I set address to manual 
and enter my IPv6, its /64 prefix, and its gateway, the system FREEZES if 
something like firefox tries to make any IPv6 access.

screen freezes, no ping, no console, good to be hard rebooted.

This doesn't happen in automatic where I get a automated IPv6 from router 
announcement, and I can add my address with
> ifconfig eth0 inet6 add myip/64
without any problem.

Ubuntu 17.04 fresh install, I had the same on a upgraded install

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: gnome-control-center 1:3.24.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-26.30-generic 4.10.17
Uname: Linux 4.10.0-26-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.4-0ubuntu4.4
Architecture: amd64
CurrentDesktop: GNOME
Date: Sat Jul 15 01:45:25 2017
ExecutablePath: /usr/bin/gnome-control-center
InstallationDate: Installed on 2017-07-14 (0 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug zesty

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https://bugs.launchpad.net/bugs/1704438

Title:
  system freezes on IPv6 manual configuration

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