[Bug 1743895] Re: Ubuntu upgrade from 14.04 to 16.04 is having problems

[Ubuntu Foundations Team Bug Bot]

** Tags added: trusty2xenial

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https://bugs.launchpad.net/bugs/1743895

Title:
  Ubuntu upgrade from 14.04 to 16.04 is having problems

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

Bug description:
  When trying to upgrade Ubuntu from 14.04 to 16.04, the upgrader errors out.
  Not sure why it's happening.

  I am on Ubuntu 14.04.5 LTS
  I want to upgrade to 16.04 LTS

  To upgrade I ran the update from the UI first and when that didn't
  work I tried: 'sudo do-release-upgrade' from the terminal

  The last few lines in the terminal when it errors out are:

  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done
  Building data structures... Done 

  Calculating the changes

  Calculating the changes

  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 1:0.220.9
  ProcVersionSignature: Ubuntu 3.13.0-139.188-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-139-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.14.1-0ubuntu3.27
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Jan 17 16:37:30 2018
  InstallationDate: Installed on 2012-04-28 (2090 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2018-01-17 (0 days ago)

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