[Bug 1839531] Re: 14.04 LTS does not upgrade to 16.04 LTS

[Eduardo dos Santos Barretto]

Thanks for taking the time to report this bug and helping to make Ubuntu
better. We appreciate the difficulties you are facing, but this appears
to be a "regular" (non-security) bug.  I have unmarked it as a security
issue since this bug does not show evidence of allowing attackers to
cross privilege boundaries nor directly cause loss of data/privacy.
Please feel free to report any other bugs you may find.

** Information type changed from Private Security to Public

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https://bugs.launchpad.net/bugs/1839531

Title:
  14.04 LTS does not upgrade to 16.04 LTS

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

Bug description:
  I am attempting to upgrade my computer's operating system from 14.04
  LTS to 16.04 LTS but, in trying to upgrade my computer's operating
  system four times or more, each and every time that I try to upgrade
  my computer's operating system, the following message always displays
  and I am, therefore, unable to upgrade my computer's operating system
  as was promised by Ubuntu: "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 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.11
  ProcVersionSignature: Ubuntu 4.4.0-148.174~14.04.1-generic 4.4.177
  Uname: Linux 4.4.0-148-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.29
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Aug  8 14:53:39 2019
  InstallationDate: Installed on 2017-12-28 (587 days ago)
  InstallationMedia: Ubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2019-08-08 (0 days ago)
  VarLogDistupgradeTermlog:

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