Public bug reported:

When you put the following lines in sysctl.conf

net.ipv6.conf.all.autoconf = 0
net.ipv6.conf.all.accept_ra = 0

the expeced result is to disable IPv6 autoconfiguration at bootup, but,
actually, it does nothing, because sysctl.conf network settings are
applied after network has been started.

So what happens:
1. Network interfaces are started by /etc/init.d/networking
1a. IPv6 uses autocnfiguratin, because it is enabled at this point
2. Sysctl.conf settings are applied by /etc/init/procps.conf

I don't know if there is an easy solution, because inverting order
things are called could break something else.

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

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https://bugs.launchpad.net/bugs/997605

Title:
  Disabling IPv6 autoconfiguration in sysctl.conf doesn't affect boot
  process

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