[Bug 1766542] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for apt has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1766542

Title:
  Installation blocks when the machine is behind a proxy server

Status in OEM Priority Project:
  Confirmed
Status in apt package in Ubuntu:
  Fix Released
Status in ubiquity package in Ubuntu:
  Incomplete
Status in apt source package in Bionic:
  Fix Committed
Status in ubiquity source package in Bionic:
  New

Bug description:
  [Impact]
  APT takes a long time to notice when certain connections time out

  [Test case]
  * Change the default route to not route stuff successfully (wrong gateway,
    for example)
  * Make your sources.list look like this:

  deb http://archive.ubuntu.com/ubuntu bionic main restricted
  deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted

  * Run apt update

  You should see that it fails with a long verbose error message for the
  first entry, with all possible IP addresses listed in it; while for
  the second one it fails with just "Unable to connect to
  archive.ubuntu.com:http:" as it recognizes it has been blacklisted.

  [Regression potential]
  APT will not attempt to retry the host given that it could not connect to it for previous entries. If your network recovered in the meantime, it might update less than previously.

  [Original bug report]
  When the machine is behind a proxy server, the installation will block for a while (several minutes) to retrieve the package lists. The timeouts are too long and makes user feels the machine may have some problems.

  The symptom is similar with bug #14599, but it seems the apt-setup
  module was rewritten.

  Another method to trigger this issue is to make the machine cannot
  access to the Internet, for instance: a wrong gateway.

  Image: 16.04

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