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[Launchpad Bug Tracker <1762766@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package apt - 1.2.27

---------------
apt (1.2.27) xenial; urgency=medium

  [ David Kalnischkies ]
  * don't hang if multiple sources use unavailable method (Closes: 870675)
    (LP: #1762766)

  [ Julian Andres Klode ]
  * Fix lock counting in debSystem (LP: #1778547)
  * apt.conf.autoremove: Catch some new Ubuntu module packages (LP: #1778551)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Tue, 26 Jun 2018 12:55:03
+0200

** Changed in: apt (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1762766

Title:
  apt-get update hangs when apt-transport-https is not installed

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Trusty:
  Triaged
Status in apt source package in Xenial:
  Fix Released
Status in apt package in Debian:
  Fix Released

Bug description:
  [Impact]
  Two or more sources with an unknown protocol cause apt update to hang. For example, when using the https method on a system without integrated https support and without apt-transport-https installed.

  [Test case]
  Add two or more sources with an unknown protocol and run update

  [Regression potential]
  This changes the code to only register a method that actually exists. I don't see any potential for a regression here, but of course, if there were any, it would be related to not finding other methods.

  [Original bug report]
  When "apt-get update" is run on a docker container running Ubuntu v16.04 and containing an additional apt source repository hosted on an https webserver, the "apt-get update" command hangs.

  The hang happens after connections to http ubuntu hosts are complete,
  and apt-get remains stuck on "Working" at 0%. Removing the sources
  file for the https repo causes apt-get to complete normally.

  The source file contains 4 separate entries to 4 different repos on
  the same https server. When the source file is modified so that just
  *one* entry exists to one repo on the https server, we suddenly get a
  sensible error message that tells us that apt-transport-https needs to
  be installed.

  Installing apt-transport-https into the docker container before adding
  the sources list to the https servers works around the problem and
  sanity returns.

  Key notes:

  - The use of docker isn't related to the bug, except that the docker
  image doesn't contain the apt-transport-https package whereas our
  cloud images do contain this package by default. This can give the
  impression that this is a docker bug when it's not.

  - The hang in "apt-get update" seems to occur when the sources file
  contains more than one entry in the file. When just one entry exists
  in the file (and all other entries are commented out) a sensible error
  messages appears.

  - We encountered this on a host that didn't support cut and paste,
  sorry :(

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