[Bug 1914970] Re: upgrade 16.04 -> 18.04 wrongly resets user permissions

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

** Tags added: third-party-packages

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https://bugs.launchpad.net/bugs/1914970

Title:
  upgrade 16.04 -> 18.04 wrongly resets user permissions

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I had modified /etc/ssmtp/revaliases and /etc/ssmtp/ssmtp.config to
  give myself read access so that my backup routine could copy them.

  After upgrading from 16.04 to 18.04 the permissions on both files were
  reset and only the group 'mail' was given read-write permission and
  'others' were denied read access to ssmtp.config.

  The upgrader should NOT have done that.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
  Uname: Linux 4.15.0-135-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Feb  8 11:59:36 2021
  InstallationDate: Installed on 2018-11-23 (807 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-02-06 (1 days ago)
  VarLogDistupgradeTermlog:

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