[Bug 1787713] Re: upgrade from 16.04 to 18.04 fails

[mizo]

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https://bugs.launchpad.net/bugs/1787713

Title:
  upgrade from 16.04 to 18.04 fails

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

Bug description:

  done: 
  ran: Software updater: upgrade to 18.04

  says: 
  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.

  expected: 
  successful upgrade

  other notes:
  rcain at rcain-Desktop-UBUNTU:~$ lsb_release -rd
  Description:	Ubuntu 16.04.5 LTS
  Release:	16.04

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  Uname: Linux 4.17.4-041704-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Aug 18 10:53:04 2018
  InstallationDate: Installed on 2015-08-31 (1082 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-18 (0 days ago)
  VarLogDistupgradeTermlog:

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