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[Launchpad Bug Tracker <1915547@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unattended-upgrades -
1.1ubuntu1.18.04.7~16.04.7

---------------
unattended-upgrades (1.1ubuntu1.18.04.7~16.04.7) xenial; urgency=medium

  * data: add md5sum history file on the data folder (LP: #1915547)
    - This file contains the md5sum of the current xenial and trusty
      version of 50unattended-upgrades. This file will be used to avoid
      prompting users about unattended-upgrade changes when upgrading
      from trusty to xenial.
  * debian/postint: make ucf command reference the md5sum history file

 -- Lucas Moura <lucas.moura@xxxxxxxxxxxxx>  Wed, 10 Feb 2021 17:37:18
-0300

** Changed in: unattended-upgrades (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1915547

Title:
  Users are prompted by ucf on upgrade from Trusty to Xenial

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  Fix Released

Bug description:
  [Impact]
  During an upgrade from trusty to xenial, users will be prompted to make a decision regarding the diff on unattended-upgrades. This is not a good user experience, specially because the user can make an uninformed decision of keeping the old config file, which will make unattended-upgrades to not work as we expect.

  [Test case]

  To reproduce the issue, you can:

  1. Launch a trusty vm
  2. Perform a do-release-upgrade and observe that you will be prompted with the 50unattended-upgrades change

  To verify that the error is fixed:

  1. Launch a trusty vm
  2. Import this ppa into the system:
     https://launchpad.net/~lamoura/+archive/ubuntu/unattended-upgrades-ppa
  3. Configure do-release-upgrade to allow using third parties during upgrade
  4. Run a do-release-upgrade
  5. Verify the prompt is no longer there and that we end up with the 
     expected 50unattended-upgrades config file

  [Where problems could occur]

  The changes in this package should only surface during an upgrade
  operation.  With this change, we are now delivering a new file to the
  system and configuring postinst to use it. Because of that, we believe
  this is the only scenario that could be affected in case of a
  regression is discovered in the package.

  
  [Discussion]
  When upgrading from trusty to xenial, we are prompted about config changes on 50unattended-upgrades with the following diff:

  --- /etc/apt/apt.conf.d/50unattended-upgrades root.root 0644 2017-05-08 19:21:39
  +++ /etc/apt/apt.conf.d/50unattended-upgrades.ucftmp root.root 0644 2020-02-17 18:03:38
  @@ -1,11 +1,13 @@
   // Automatically upgrade packages from these (origin:archive) pairs
   Unattended-Upgrade::Allowed-Origins {
  + "${distro_id}:${distro_codename}";
   "${distro_id}:${distro_codename}-security";
   // Extended Security Maintenance; doesn't necessarily exist for
   // every release and this system may not have it installed, but if
   // available, the policy for updates is such that unattended-upgrades
   // should also install from here by default.
  - "${distro_id}ESM:${distro_codename}";
  + "${distro_id}ESMApps:${distro_codename}-apps-security";
  + "${distro_id}ESM:${distro_codename}-infra-security";
   // "${distro_id}:${distro_codename}-updates";
   // "${distro_id}:${distro_codename}-proposed";
   // "${distro_id}:${distro_codename}-backports";

  The reason we are presented with this diff is that the xenial package
  does not contain a md5sum history file that informs ucf about all the
  supported configs for 50unattended-upgrades. To fix that upgrade
  problem, we are prosing the following changes on the xenial package of
  unattended-upgrades:

      - Add 50unattended-upgrades.md5sum file into the xenial package
      - Add md5sum of the current xenial 50unattende-upgrades file into the md5sum history file
      - Modify ucf command in postinst to be aware of the md5sum history file

  See the changelog entry below for a full list of changes and bugs.

  We have performed a manual test with a modified version of the xenial package:
  https://launchpad.net/~lamoura/+archive/ubuntu/unattended-upgrades-ppa

  Using that package, we were able to verify that the config change
  prompt no longer happens from trusty to xenial.

  Since we are modifying are features on unattended-upgrades, just
  adding a new file to package, we don't believe there is any regression
  potential

  
  == Changelog ==

    * data: add md5sum history file on the data folder
      - This file contains md5sum of several supported 50unattended-upgrades
        config files
    * data: add xenial md5sum of 50unattented-upgrades into md5sum file
    * debian/postint: make ucf command reference the md5sum history file

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