[Bug 1801571] Re: Distribution upgrade error(upgrading from 16.04 to 18.04). Error in 2nd step.contents of '/etc/update-manager/release-upgrades' modified.

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

** Tags added: third-party-packages

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https://bugs.launchpad.net/bugs/1801571

Title:
  Distribution upgrade error(upgrading from 16.04 to 18.04). Error in
  2nd step.contents of '/etc/update-manager/release-upgrades' modified.

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

Bug description:
  Could not calculate the error:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This can be caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  * Running the current pre-release version of Ubuntu 
  * Unofficial software packages not provided by Ubuntu 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-38.41~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-38-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Nov  4 12:00:36 2018
  InstallationDate: Installed on 2017-09-02 (427 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-11-04 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2018-11-04T11:34:35.428382

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