Public bug reported:

RFC 6761 6.3 requires that "localhost" (and variations) resolve to
127.0.0.1 or ::1 for IPv4 and IPv6, respectively.

In instances that are installed with D-I (such as the server ISO), I
see:

::1     localhost ip6-localhost ip6-loopback

However, in our cloud-images (or derivatives such as LXD), OR in
Ubiquity installations, I see:

::1 ip6-localhost ip6-loopback

My examples are from Xenial.

The latter examples, should be fixed up to include localhost for IPv6
per RFC guidance.

Opening bug here per IRC conversation with Steve Langasek.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1644009

Title:
  /etc/hosts ::1 line should additionally include 'localhost'

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