[Bug 1716877] Re: /etc/network/interfaces is left unconfigured when installing in an v6-only environment

[Witold Krecicki]

I've verified this on current ubuntu-16.04.3-server-amd64.iso
(SHA1=f3532991e031cae75bcf5e695afb844dd278fff9)

The scenario I used this time was a VM with two NICs, first one
connected to v6 only network (with dhcpv6), second one disconnected.
When installing Ubuntu everything is ok, it configures the network and
downloads packages, but after first boot it's as above - /e/n/i doesn't
have any entries for NICs, just lo.

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https://bugs.launchpad.net/bugs/1716877

Title:
  /etc/network/interfaces is left unconfigured when installing in an
  v6-only environment

Status in debian-installer package in Ubuntu:
  Incomplete

Bug description:
  When installing 16.04 in a v6-only environment (with dhcpv6 RA)
  /etc/network/interfaces is left unconfigured, I'd expect it to have an
  entry like:

  auto eno1
  iface eno1 inet6 auto
  or
  iface eno1 inet6 dhcp

  But there's no entry for anything but loopback.

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