Public bug reported:
Disclaimer: I'm not sure if this is a bug, or a feature. If it is not a
bug, I think reporting this issue is useful anyway because it causes
long delays in apt-get install / apt-get update.
On dual-stack setups (IPv4 and IPv6), if one of the two paths is slow or
non-functional at all, the overall application experience can be slow.
An application that uses a Happy Eyeballs (RFC 6555) algorithm checks
both IPv4 and IPv6 connectivity (with a preference for IPv6) and uses
the first connection that is returned. This has been implemented in, for
example, Chrome and Firefox.
apt / apt-get does not have this functionality. Due to this lack, a apt-
get run can be very slow: a "sudo apt-get update" can take up to 15
minutes on a system with a non-functional IPv6 connection, even if the
system is already uptodate, which normally only takes 15 seconds or so.
"man apt.conf" shows this info:
ForceIPv4
When downloading, force to use only the IPv4 protocol.
ForceIPv6
When downloading, force to use only the IPv6 protocol.
So no feature "RFC6555" or "HappyEyeballs".
An ugly work-around is this: Create a file /etc/apt/apt.conf.d/99timeout
with these contents
Acquire::http::Timeout "2";
Acquire::ftp::Timeout "2";
That way, after 2 seconds the other path is chosen.
$ lsb_release -rd
Description: Ubuntu 14.04 LTS
Release: 14.04
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: apt 1.0.1ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Apr 15 20:26:25 2014
InstallationDate: Installed on 2014-04-10 (4 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140410)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: apt (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1308200
Title:
apt-get not RFC6555 (Happy Eyeballs) compliant
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