Public bug reported:

$ systemd-resolve ubuntu.com
ubuntu.com: resolve call failed: DNSSEC validation failed: no-signature


/etc/systemd/resolved.conf
[Resolve]
#DNS=
#FallbackDNS=8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844
#Domains=
#LLMNR=yes
#DNSSEC=allow-downgrade
#Cache=yes
#DNSStubListener=udp
--- 
ApportVersion: 2.20.4-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
DistroRelease: Ubuntu 17.04
EcryptfsInUse: Yes
MachineType: System76, Inc Darter UltraThin
Package: systemd 232-18ubuntu1 [origin: unknown]
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-9-generic 
root=UUID=5aa160f9-0a01-4291-8d9d-704469e9a970 ro noapic acpi_backlight=vendor 
i915.disable_power_well=0
ProcVersionSignature: Ubuntu 4.10.0-9.11-generic 4.10.0
Tags: third-party-packages zesty
Uname: Linux 4.10.0-9-generic x86_64
UnreportableReason: This is not an official Ubuntu package. Please remove any 
third party package and try again.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm autopilot cdrom dialout dip lpadmin lxd plugdev sambashare sudo 
wireshark
_MarkForUpload: True
dmi.bios.date: 10/28/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.5
dmi.board.asset.tag: Tag 12345
dmi.board.name: Darter UltraThin
dmi.board.vendor: System76, Inc
dmi.board.version: daru4
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: System76, Inc
dmi.chassis.version: N/A
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd10/28/2013:svnSystem76,Inc:pnDarterUltraThin:pvrdaru4:rvnSystem76,Inc:rnDarterUltraThin:rvrdaru4:cvnSystem76,Inc:ct9:cvrN/A:
dmi.product.name: Darter UltraThin
dmi.product.version: daru4
dmi.sys.vendor: System76, Inc

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-collected third-party-packages zesty

** Tags added: apport-collected third-party-packages zesty

** Description changed:

  $ systemd-resolve ubuntu.com
  ubuntu.com: resolve call failed: DNSSEC validation failed: no-signature
  
  
  /etc/systemd/resolved.conf
  [Resolve]
  #DNS=
  #FallbackDNS=8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844
  #Domains=
  #LLMNR=yes
  #DNSSEC=allow-downgrade
  #Cache=yes
  #DNSStubListener=udp
+ --- 
+ ApportVersion: 2.20.4-0ubuntu2
+ Architecture: amd64
+ CurrentDesktop: GNOME
+ DistroRelease: Ubuntu 17.04
+ EcryptfsInUse: Yes
+ MachineType: System76, Inc Darter UltraThin
+ Package: systemd 232-18ubuntu1 [origin: unknown]
+ PackageArchitecture: amd64
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-9-generic 
root=UUID=5aa160f9-0a01-4291-8d9d-704469e9a970 ro noapic acpi_backlight=vendor 
i915.disable_power_well=0
+ ProcVersionSignature: Ubuntu 4.10.0-9.11-generic 4.10.0
+ Tags: third-party-packages zesty
+ Uname: Linux 4.10.0-9-generic x86_64
+ UnreportableReason: This is not an official Ubuntu package. Please remove any 
third party package and try again.
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm autopilot cdrom dialout dip lpadmin lxd plugdev sambashare 
sudo wireshark
+ _MarkForUpload: True
+ dmi.bios.date: 10/28/2013
+ dmi.bios.vendor: American Megatrends Inc.
+ dmi.bios.version: 4.6.5
+ dmi.board.asset.tag: Tag 12345
+ dmi.board.name: Darter UltraThin
+ dmi.board.vendor: System76, Inc
+ dmi.board.version: daru4
+ dmi.chassis.asset.tag: No Asset Tag
+ dmi.chassis.type: 9
+ dmi.chassis.vendor: System76, Inc
+ dmi.chassis.version: N/A
+ dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd10/28/2013:svnSystem76,Inc:pnDarterUltraThin:pvrdaru4:rvnSystem76,Inc:rnDarterUltraThin:rvrdaru4:cvnSystem76,Inc:ct9:cvrN/A:
+ dmi.product.name: Darter UltraThin
+ dmi.product.version: daru4
+ dmi.sys.vendor: System76, Inc

-- 
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https://bugs.launchpad.net/bugs/1672235

Title:
  zesty switch from dnsmasq caused lookup errors, DNSSEC validation
  failed: no-signature

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