[Bug 1561250] Re: Xenial vagrant image is missing its hostname in /etc/hosts

[Keilo]

I can confirm this issue is also present when running on macOS.

-------------------------------------------------------------------------------------
$ uname -a
Darwin 15.5.0 Darwin Kernel Version 15.5.0: Tue Apr 19 18:36:36 PDT 2016; root:xnu-3248.50.21~8/RELEASE_X86_64 x86_64

$ vagrant --version
Vagrant 1.8.4

$ vboxmanage --version
5.0.22r108108

$ vagrant box list | grep xenial
ubuntu/xenial64       (virtualbox, 20160615.1.0)

$ vagrant init ubuntu/xenial64

$ vagrant ssh

$ sudo cat /etc/hosts
sudo: unable to resolve host ubuntu-xenial
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
-------------------------------------------------------------------------------------

Note the "sudo: unable to resolve host ubuntu-xenial" above.

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https://bugs.launchpad.net/bugs/1561250

Title:
  Xenial vagrant image is missing its hostname in /etc/hosts

Status in cloud-images:
  Confirmed
Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  The vagrant build for xenial is missing an in /etc/hosts. This
  generates an error when running sudo.

  ubuntu at ubuntu-xenial:~$ cat /etc/hosts
  127.0.0.1 localhost

  # The following lines are desirable for IPv6 capable hosts
  ::1 ip6-localhost ip6-loopback
  fe00::0 ip6-localnet
  ff00::0 ip6-mcastprefix
  ff02::1 ip6-allnodes
  ff02::2 ip6-allrouters
  ff02::3 ip6-allhosts
  ubuntu at ubuntu-xenial:~$ sudo echo see the error ^^^^
  sudo: unable to resolve host ubuntu-xenial
  see the error ^^^^
  ubuntu at ubuntu-xenial:~$

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