[Bug 1896772] Re: systemd-resolved configures no Current Scopes on start

[Dan Watkins]

> How did resolve/netif get owned by root?

I don't believe I've ever touched it before, so I'm not sure.  I haven't
rebooted since that last comment, I'll do that at some point today to
check if ownership reverts to root.

If it does, what debugging can I perform to determine what's doing it?

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Title:
  systemd-resolved configures no Current Scopes on start

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  Running groovy on the desktop, with the systemd packages that migrated
  today(/overnight EDT).

  # Steps to reproduce:

  1) `systemctl restart systemd-resolved.service`

  (This is a minimal reproducer, but I first saw this after an apt
  upgrade of systemd.)

  # Expected behaviour:

  DNS continues to work, status looks like this:

  Link 2 (enp5s0)
        Current Scopes: DNS
  DefaultRoute setting: yes
         LLMNR setting: yes
  MulticastDNS setting: no
    DNSOverTLS setting: no
        DNSSEC setting: no
      DNSSEC supported: no
    Current DNS Server: 192.168.1.1
           DNS Servers: 192.168.1.1
            DNS Domain: ~.
                        lan

  # Actual behaviour:

  DNS is unconfigured:

  Link 2 (enp5s0)
        Current Scopes: none
  DefaultRoute setting: no
         LLMNR setting: yes
  MulticastDNS setting: no
    DNSOverTLS setting: no
        DNSSEC setting: no
      DNSSEC supported: no

  # Workaround

  Disconnecting and reconnecting my network connection restored DNS
  functionality.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: systemd 246.5-1ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
  Uname: Linux 5.8.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu45
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: i3
  CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted
  Date: Wed Sep 23 09:05:42 2020
  InstallationDate: Installed on 2019-05-07 (504 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  MachineType: Gigabyte Technology Co., Ltd. B450M DS3H
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-18-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash resume=UUID=73909634-a75d-42c9-8f66-a69138690756 pcie_aspm=off vt.handoff=7
  RebootRequiredPkgs: gnome-shell
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/user at .service → /lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  SystemdFailedUnits:
   Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use systemd-escape?).
   Unit \xe2\x97\x8f.service could not be found.
   ------
   Error: command ['systemctl', 'status', '--full', '●'] failed with exit code 4: Invalid unit name "●" escaped as "\xe2\x97\x8f" (maybe you should use systemd-escape?).
   Unit \xe2\x97\x8f.service could not be found.
  UpgradeStatus: Upgraded to groovy on 2020-06-22 (92 days ago)
  dmi.bios.date: 01/25/2019
  dmi.bios.release: 5.13
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F4
  dmi.board.asset.tag: Default string
  dmi.board.name: B450M DS3H-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF4:bd01/25/2019:br5.13:svnGigabyteTechnologyCo.,Ltd.:pnB450MDS3H:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB450MDS3H-CF:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: B450M DS3H
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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