This bug was fixed in the package resolvconf - 1.69ubuntu1.4

resolvconf (1.69ubuntu1.4) trusty-proposed; urgency=medium

  * Read and apply dns information written by initramfs if
    using rooturl (root=http* on the command line) (LP: #1735225)

 -- Scott Moser <>  Wed, 29 Nov 2017 14:08:30 -0500

** Changed in: resolvconf (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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  root=<url> should automatically enable 'rc-initrd-dns' feature

Status in resolvconf source package in Trusty:
  Fix Released
Status in resolvconf source package in Xenial:
  Fix Released

Bug description:
  === Begin SRU Template ===
  Booting a kernel/initramfs with 'rooturl=http://...' for trusty
  or xenial requires also adding 'rc-initrd-dns' or 'cloud-config-url='
  to the kernel command line in order to get the fix provided by bug

  If a user boots with 'rooturl=', that should imply they want dns
  copied over from the initramfs or otherwise working dns.  They should
  not have to add the additional flag.

  [Test Case]
  Download the test case attached.
  Run it and follow the instructions.
  Login to the guest (ubuntu:password), and inspect /etc/resolv.conf
  without the fix there would be no data in /etc/resolv.conf. With the
  fix you should see 'nameserver' and 'search'

  [Regression Potential]
  Regression potential should be very low.
  This could negatively affect a user who was booting with rooturl=
  and had solved the lack of dns in another way.

  [Other Info]
  rooturl was SRU'd to xenial and trusty.  When that happened we were
  not aware of the broken-ness of DNS.  Had we been aware at that time,
  we would have fixed this then, and the regression potential listed above
  would not be present.

  Note, that without a fix for bug 1714308, dns does not work inside
  the initramfs.  So the url in 'rooturl=<url>' has to be an IP address.

  Related bugs:
   * bug 1714308: dns does not work in initramfs after configure_networking 
   * bug 1711760: [2.3] resolv.conf is not set (during commissioning or 
  === End SRU Template ===

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: resolvconf 1.78ubuntu5
  ProcVersionSignature: User Name 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.13
  Architecture: amd64
  Date: Wed Nov 29 17:33:21 2017
  PackageArchitecture: all
   PATH=(custom, no user)
  SourcePackage: resolvconf
  UpgradeStatus: No upgrade log present (probably fresh install)

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