[Bug 1849902] Re: upgrader from xenial to bionic fails without any clear error message

[Claviger]

apt pinning was in use in /etc/apt/preferences

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1849902

Title:
  upgrader from xenial to bionic fails without any clear error message

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

Bug description:
  TRying to upgrade from xenial to bionic on headless server.  The
  upgrader fails without a clear reason why

  
  Description:    Ubuntu 16.04.6 LTS
  Release:        16.04

  
  apt-cache policy update-manager-core
  update-manager-core:
    Installed: 1:16.04.16
    Candidate: 1:16.04.16
    Version table:
   *** 1:16.04.16 900
          900 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          900 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
          100 /var/lib/dpkg/status
       1:16.04.12 900
          900 http://us.archive.ubuntu.com/ubuntu xenial-security/main amd64 Packages
          900 http://us.archive.ubuntu.com/ubuntu xenial-security/main i386 Packages
       1:16.04.3 900
          900 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          900 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.27
  ProcVersionSignature: Ubuntu 4.4.0-167.196-generic 4.4.197
  Uname: Linux 4.4.0-167-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.19
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Oct 25 16:01:51 2019
  InstallationDate: Installed on 2017-03-03 (966 days ago)
  InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.8)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-10-25 (0 days ago)

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