[Bug 1742509] Re: software-properties-gtk should not disable security.ubuntu.com mirror to local one

[Norbert]

** Tags removed: artful trusty zesty

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https://bugs.launchpad.net/bugs/1742509

Title:
  software-properties-gtk should not disable security.ubuntu.com mirror
  to local one

Status in software-properties package in Ubuntu:
  New

Bug description:
  Steps to reproduce:
  1. Install Ubuntu without any changes in /etc/apt/sources.list
  (ensure that is has http://security.ubuntu.com/ubuntu

  $ grep http://security.ubuntu.com/ubuntu /etc/apt/sources.list | grep -v ^#
  deb http://security.ubuntu.com/ubuntu xenial-security main restricted
  deb http://security.ubuntu.com/ubuntu xenial-security universe
  deb http://security.ubuntu.com/ubuntu xenial-security multiverse
  $

  ).
  2. Launch `software-properties-gtk` and select local mirror, for example Switzerland mirror.switch.ch (or *Select Best Server*), *Reload* lists and check again:

  $grep http://security.ubuntu.com/ubuntu /etc/apt/sources.list | grep -v ^#
  $ # returns nothing

  Notes:
  * I discovered this while upgrading my machines to fix Meltdown vulnerability (as bug 1741934 and kernels 4.4.0-108 and 4.4.0-109). Only one my machine was upgraded to 109. It used *Main server* and http://security.ubuntu.com/ubuntu.
  * All releases seems to be affected by this mirror-problem.
  * Setting back to *Main server* does not return http://security.ubuntu.com/ubuntu to sources.list.
  * This clearly does not correspond to the official documentation ( https://wiki.ubuntu.com/SecurityTeam/FAQ#What_repositories_and_pockets_should_I_use_to_make_sure_my_systems_are_up_to_date.3F )

  Expected results:
  * Ubuntu must save http://security.ubuntu.com/ubuntu mirror in /etc/apt/sources.list for really fast fixing of critical bugs

  Actual results:
  * Ubuntu switches all mirrors and disables http://security.ubuntu.com/ubuntu .

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: software-properties-gtk 0.96.20.7
  ProcVersionSignature: Ubuntu 4.4.0-104.127-generic 4.4.98
  Uname: Linux 4.4.0-104-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Jan 10 20:57:55 2018
  InstallationDate: Installed on 2018-01-04 (6 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: software-properties
  UpgradeStatus: No upgrade log present (probably fresh install)

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