[Bug 1843554] [NEW] apt update is trying to use IPv6 for some reason, which does not work

Marius Gedminas marius at gedmin.as
Wed Sep 11 08:51:05 UTC 2019 

Public bug reported:

Today I've discovered that I cannot use apt-get any more:

    apt update
    Hit:1 http://ppa.launchpad.net/mgedmin/ppa/ubuntu disco InRelease
    Ign:2 http://ddebs.ubuntu.com disco InRelease
    Ign:3 http://ddebs.ubuntu.com disco-updates InRelease
    Hit:4 http://ppa.launchpad.net/pov/ppa/ubuntu disco InRelease
    Hit:5 http://ddebs.ubuntu.com disco Release
    Hit:6 http://security.ubuntu.com/ubuntu disco-security InRelease
    Hit:7 http://ddebs.ubuntu.com disco-updates Release
    0% [Connecting to lt.archive.ubuntu.com (2001:778:1::d)]

and there it stalls for about 30 seconds, after which

    Err:10 http://lt.archive.ubuntu.com/ubuntu disco InRelease
      Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Could not connect to lt.archive.ubuntu.com:80 (83.171.20.4), connection timed out
    Err:11 http://lt.archive.ubuntu.com/ubuntu disco-updates InRelease
      Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
    Err:12 http://lt.archive.ubuntu.com/ubuntu disco-backports InRelease
      Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    16 packages can be upgraded. Run 'apt list --upgradable' to see them.
    W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco/InRelease  Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Could not connect to lt.archive.ubuntu.com:80 (83.171.20.4), connection timed out
    W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco-updates/InRelease  Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
    W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco-backports/InRelease  Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
    W: Some index files failed to download. They have been ignored, or old ones used instead.

I don't know why it's trying to connect to my Ubuntu mirror over IPv6.
There's no IPv6 in Lithuania (I'm exaggerating a bit, but my ISP -- the
largest ISP in the country -- does not support IPv6).  I've never had
working IPv6 connectivity in my life.  apt-get used to work before
today.  I've no idea what changed.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: apt 1.8.1
ProcVersionSignature: Ubuntu 5.0.0-27.28-generic 5.0.21
Uname: Linux 5.0.0-27-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 11 11:46:28 2019
EcryptfsInUse: Yes
InstallationDate: Installed on 2019-06-12 (90 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug disco wayland-session

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https://bugs.launchpad.net/bugs/1843554

Title:
  apt update is trying to use IPv6 for some reason, which does not work

Status in apt package in Ubuntu:
  New

Bug description:
  Today I've discovered that I cannot use apt-get any more:

      apt update
      Hit:1 http://ppa.launchpad.net/mgedmin/ppa/ubuntu disco InRelease
      Ign:2 http://ddebs.ubuntu.com disco InRelease
      Ign:3 http://ddebs.ubuntu.com disco-updates InRelease
      Hit:4 http://ppa.launchpad.net/pov/ppa/ubuntu disco InRelease
      Hit:5 http://ddebs.ubuntu.com disco Release
      Hit:6 http://security.ubuntu.com/ubuntu disco-security InRelease
      Hit:7 http://ddebs.ubuntu.com disco-updates Release
      0% [Connecting to lt.archive.ubuntu.com (2001:778:1::d)]

  and there it stalls for about 30 seconds, after which

      Err:10 http://lt.archive.ubuntu.com/ubuntu disco InRelease
        Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Could not connect to lt.archive.ubuntu.com:80 (83.171.20.4), connection timed out
      Err:11 http://lt.archive.ubuntu.com/ubuntu disco-updates InRelease
        Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
      Err:12 http://lt.archive.ubuntu.com/ubuntu disco-backports InRelease
        Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
      Reading package lists... Done
      Building dependency tree
      Reading state information... Done
      16 packages can be upgraded. Run 'apt list --upgradable' to see them.
      W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco/InRelease  Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable) Could not connect to lt.archive.ubuntu.com:80 (83.171.20.4), connection timed out
      W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco-updates/InRelease  Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
      W: Failed to fetch http://lt.archive.ubuntu.com/ubuntu/dists/disco-backports/InRelease  Cannot initiate the connection to lt.archive.ubuntu.com:80 (2001:778:1::d). - connect (101: Network is unreachable)
      W: Some index files failed to download. They have been ignored, or old ones used instead.

  I don't know why it's trying to connect to my Ubuntu mirror over IPv6.
  There's no IPv6 in Lithuania (I'm exaggerating a bit, but my ISP --
  the largest ISP in the country -- does not support IPv6).  I've never
  had working IPv6 connectivity in my life.  apt-get used to work before
  today.  I've no idea what changed.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: apt 1.8.1
  ProcVersionSignature: Ubuntu 5.0.0-27.28-generic 5.0.21
  Uname: Linux 5.0.0-27-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Sep 11 11:46:28 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2019-06-12 (90 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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