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

[christophe]

On trusty, the hostname was not in /etc/hosts and it was working fine.
The real issue here is that sudo looks into DNS before hostname.

In /etc/nsswitch.conf, we had on trusty:
hosts:          files myhostname mdns4_minimal [NOTFOUND=return] dns

We now have:
hosts:          files mdns4_minimal [NOTFOUND=return] dns myhostname

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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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