[Bug 1637820] Re: 'sudo do-release-upgrade' failed

[Ubuntu Foundations Team Bug Bot]

** Tags added: trusty2xenial

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https://bugs.launchpad.net/bugs/1637820

Title:
  'sudo do-release-upgrade' failed

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

Bug description:
  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. }

  This error occurred during the sudo do-release-upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 4.4.0-45.66~14.04.1-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  NonfreeKernelModules: wl nvidia
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Oct 30 19:15:23 2016
  InstallationDate: Installed on 2015-11-14 (351 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-10-30 (0 days ago)

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