[Bug 1777428] Re: UpdateManager does not work behind proxy in many cases

[Mathieu Trudel-Lapierre]

** Tags removed: rls-cc-incoming
** Tags added: rls-cc-notfixing

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https://bugs.launchpad.net/bugs/1777428

Title:
  UpdateManager does not work behind proxy in many cases

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  update-manager does not work behind a proxy in many cases.
  reason:
  update-manager calls method init_proxy() in UpdateManager/Core/utils.py.
  This method does not implement what is described in its documentation string:
  1. the implementation does not check the http_proxy environment variable
  2. it tries to read the file /root/.synaptic/synaptic.conf, but due to the access rights drwx------ on the '/root' directory, it can't read the file, unless the user is exactly 'root', but that is rightly completely discouraged by Ubuntu.

  The only option that works is the addition of Acquire::http::Proxy to
  some config file in /etc/apt/apt.conf.d

  It means that update-manager does not work when the user has added
  proxy settings in its Preferences.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: python3-update-manager 1:18.04.11.2
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Mon Jun 18 13:37:42 2018
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'window-height' b'671'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'window-width' b'898'
   b'com.ubuntu.update-manager' b'launch-time' b'int64 1529319882'
  InstallationDate: Installed on 2018-05-15 (34 days ago)
  InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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