[Bug 1920781] Re: Mobile phone hotspot unusable due to systemd-resolved not liking the DNS

[Launchpad Bug Tracker]

[Expired for systemd (Ubuntu Groovy) because there has been no activity
for 60 days.]

** Changed in: systemd (Ubuntu Groovy)
       Status: Incomplete => Expired

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Title:
  Mobile phone hotspot unusable due to systemd-resolved not liking the
  DNS

Status in systemd package in Ubuntu:
  Expired
Status in systemd source package in Focal:
  Expired
Status in systemd source package in Groovy:
  Expired

Bug description:
  Seen in 20.04.

  Trying to connect to the internet using the mobile phone hotspot is
  impossible due to systemd-resolved not resolving and reporting things
  like:

  resolve call failed: DNSSEC validation failed: incompatible-server

  and

  systemd-resolved[81699]: DNSSEC validation failed for question d.3.1.b.d.e.1.e.1.6.9.e.7.8.4.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa IN PTR: no-signature
  DNSSEC validation failed for question b.d.e.1.e.1.6.9.e.7.8.4.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa IN DS: no-signature

  etc etc.

  Name resolution works just fine from the mobile phone.

  Funny thing is that the issue persists if DNSSEC is disabled via
  resolvectl for the interface:

  Link 3 (wlan0)
        Current Scopes: DNS          
  DefaultRoute setting: yes          
         LLMNR setting: yes          
  MulticastDNS setting: no           
    DNSOverTLS setting: opportunistic
        DNSSEC setting: no           
      DNSSEC supported: no           
    Current DNS Server: 192.168.43.1 
           DNS Servers: 192.168.43.1

  Systemd-resolved won't accept the issue to be reported upstream saying
  that a too old version of systemd is being used.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.5
  ProcVersionSignature: Ubuntu 5.8.0-45.51~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-45-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Mon Mar 22 15:39:23 2021
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2020-02-16 (400 days ago)
  InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  MachineType: SCHENKER SCHENKER_SLIM14_SSL14L19
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-45-generic root=/dev/mapper/VG_NVMe-root ro quiet splash vt.handoff=7
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /usr/lib/systemd/system/rc-local.service → /usr/lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /usr/lib/systemd/system/user at .service → /usr/lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  UpgradeStatus: Upgraded to focal on 2020-05-23 (303 days ago)
  dmi.bios.date: 10/02/2019
  dmi.bios.release: 7.4
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: 1.07.04RTR1
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: N141CU
  dmi.board.vendor: SCHENKER
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.ec.firmware.release: 7.2
  dmi.modalias: dmi:bvnINSYDECorp.:bvr1.07.04RTR1:bd10/02/2019:br7.4:efr7.2:svnSCHENKER:pnSCHENKER_SLIM14_SSL14L19:pvrNotApplicable:rvnSCHENKER:rnN141CU:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
  dmi.product.family: Not Applicable
  dmi.product.name: SCHENKER_SLIM14_SSL14L19
  dmi.product.sku: Not Applicable
  dmi.product.version: Not Applicable
  dmi.sys.vendor: SCHENKER
  modified.conffile..etc.systemd.resolved.conf: [modified]
  mtime.conffile..etc.systemd.resolved.conf: 2021-02-10T11:20:21.512139
  mtime.conffile..etc.systemd.sleep.conf: 2020-08-13T07:55:23.365733

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