** Package changed: systemd (Ubuntu) => resolvconf (Ubuntu)

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

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https://bugs.launchpad.net/bugs/1763108

Title:
  xenial2bionic release upgrade loses DNS: empty resolv.conf

Status in resolvconf package in Ubuntu:
  Fix Committed

Bug description:
  Note: I'm not sure which package better represents this bug, so I used
  systemd, because /etc/resolv.conf had no "nameserver 127.0.0.53" entry
  after the upgrade.

  
  I did a plain standard lxd deploy of xenial, using the default images. 
Upgraded it to the latest xenial packages, and then issued a release upgrade to 
bionic.

  At the end of the upgrade process, rebooted, and when the system came
  back up, /etc/resolv.conf had no nameserver entries:

  root@xenial2bionic:~# cat /etc/resolv.conf
  # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
  #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
  # 127.0.0.53 is the systemd-resolved stub resolver.
  # run "systemd-resolve --status" to see details about the actual nameservers.

  That was its whole content. Before the upgrade, in xenial, it had:
  root@xenial2bionic:~# cat /etc/resolv.conf
  # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
  #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
  nameserver 10.0.100.1
  search lxd

  systemd-resolve in the system after the upgrade to bionic was working just 
fine:
  root@xenial2bionic:~# systemd-resolve --status
  Global
           DNS Servers: 10.0.100.1
            DNS Domain: lxd
            DNSSEC NTA: 10.in-addr.arpa
                        16.172.in-addr.arpa
                        168.192.in-addr.arpa
                        17.172.in-addr.arpa
                        18.172.in-addr.arpa
                        19.172.in-addr.arpa
                        20.172.in-addr.arpa
                        21.172.in-addr.arpa
                        22.172.in-addr.arpa
                        23.172.in-addr.arpa
                        24.172.in-addr.arpa
                        25.172.in-addr.arpa
                        26.172.in-addr.arpa
                        27.172.in-addr.arpa
                        28.172.in-addr.arpa
                        29.172.in-addr.arpa
                        30.172.in-addr.arpa
                        31.172.in-addr.arpa
                        corp
                        d.f.ip6.arpa
                        home
                        internal
                        intranet
                        lan
                        local
                        private
                        test

  Link 34 (eth0)
        Current Scopes: none
         LLMNR setting: yes
  MulticastDNS setting: no
        DNSSEC setting: no
      DNSSEC supported: no

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu7
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  Date: Wed Apr 11 17:31:08 2018
  MachineType: LENOVO 20HRCTO1WW
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-13-generic.efi.signed 
root=ZFS=nsnx/ROOT/ubuntu ro quiet splash vt.handoff=1
  SourcePackage: systemd
  UpgradeStatus: Upgraded to bionic on 2018-04-11 (0 days ago)
  dmi.bios.date: 11/09/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1MET41W (1.26 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20HRCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1MET41W(1.26):bd11/09/2017:svnLENOVO:pn20HRCTO1WW:pvrThinkPadX1Carbon5th:rvnLENOVO:rn20HRCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 5th
  dmi.product.name: 20HRCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 5th
  dmi.sys.vendor: LENOVO

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