As I suggested in bug 1634176, I think that we can extend the 'ip='
parameter to work as it has a 'autoconf' parameter in it, which
indicates the type of "auto" configuration to do:

klibc documents the previous ip= syntax at README.ipconfig [1].
  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>

My suggestion is to extend the 'autoconf' parameter. Previously the
supported documented values were 'rarp', 'bootp', 'both', 'dhcp', 'all',
'off', 'static', 'none'. I suggest we add 'dhcp6' to the the list.

We could also support 'dhcp4,dhcp6' or 'dhcp+dhcp6' indicating both
should be tried or possibly dhcp6 if and only if dhcp4 failed.  I think
though, for the immediate use case that just adding 'dhcp6' to the
autoconf types would suffice.

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https://bugs.launchpad.net/bugs/1621507

Title:
  initramfs-tools configure_networking() fails to dhcp ipv6 addresses

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