[Bug 1874113] [NEW] IPv6 not working

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IPv6 worked with 20.04 kernel 5.4.0-21-generic

After upgrading it does not work. Not sure if it is kernel related or
something else.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-25-generic 5.4.0-25.29
ProcVersionSignature: Ubuntu 5.4.0-25.29-generic 5.4.30
Uname: Linux 5.4.0-25-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.4.0-25-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D9p', '/dev/snd/pcmC1D8p', '/dev/snd/pcmC1D7p', '/dev/snd/pcmC1D3p', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Card1.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card1.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
CasperMD5CheckResult: skip
Date: Tue Apr 21 19:44:10 2020
InstallationDate: Installed on 2020-04-13 (8 days ago)
InstallationMedia: Ubuntu-Server 20.04 LTS "Focal Fossa" - Beta amd64 (20200401)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: MSI MS-7885
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-25-generic root=UUID=e798385b-96fa-4adf-9304-6f3a3a61a9b3 ro
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-25-generic N/A
 linux-backports-modules-5.4.0-25-generic  N/A
 linux-firmware                            1.187
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/05/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.40
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: X99S SLI PLUS (MS-7885)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.40:bd11/05/2014:svnMSI:pnMS-7885:pvr1.0:rvnMSI:rnX99SSLIPLUS(MS-7885):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7885
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 1.0
dmi.sys.vendor: MSI

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug focal
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IPv6 not working
https://bugs.launchpad.net/bugs/1874113
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