This patch changes the way how existing installations get their IPv6
address which is something that really shouldn't be done in an update to
an LTS release in my opinion. Even worse it completely overrules
configuration in /etc/sysctl.d/10-ipv6-privacy.conf and if you change
the configuration on a running system network-manager changes it back
within a second! For example

runge:~# sysctl -w net.ipv6.conf.eth0.use_tempaddr=0
net.ipv6.conf.eth0.use_tempaddr = 0

wait a few seconds while network-manager says something about
disconnected wired interface

runge:~# sysctl net.ipv6.conf.eth0.use_tempaddr     
net.ipv6.conf.eth0.use_tempaddr = 2

Network-manager shouldn't overrule the system configuration, especially
when network-manager currently has no toggle for privacy extensions. If
you think changing the default is okay in a stable update (I really
don't), at least it should be done in a way that makes it possible to
easily go back to the previous behaviour. Given that the sysctl default
is already what we want as default, I don't see why NM has to explicitly
set it again and if it doesn't do that it would be possible to change
the configuration in /etc/sysctl.

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https://bugs.launchpad.net/bugs/990011

Title:
  use_tempaddr is *still* not set properly for default eth0 connections

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