[Bug 1789111] Re: LTS Distro upgrde fails.

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

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https://bugs.launchpad.net/bugs/1789111

Title:
  LTS Distro upgrde fails.

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

Bug description:
  Upgrade from 16.04-LTS to 18.04-LTS fails without sufficient
  error/alerting to resolve.

  Possible issue is third party or legacy software but nothing is
  identified.

  lsb_release -rd
  Description:	Ubuntu 16.04.5 LTS
  Release:	16.04

  Command Use:
  do-release-upgrade

  Expected: upgrade to commence

  Actual: upgrade exits with error

  Could not determine 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. 


  Issue:  No detail given of what is causing the issue.

  existing and future version are not pre-release

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-133.159-generic 4.4.134
  Uname: Linux 4.4.0-133-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Aug 26 17:14:50 2018
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-26 (0 days ago)

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