[Bug 1661932] Re: Could not calculate the upgrade

[Ubuntu Foundations Team Bug Bot]

** Tags added: trusty2xenial

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https://bugs.launchpad.net/bugs/1661932

Title:
  Could not calculate the upgrade

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

Bug description:
  When I tried to upgrade from ubuntu 14.04 to ubuntu 16.04. 
  I got the following errors and after this it failed and stopped upgrading.

  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. 

  
  Restoring original system state

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


  I got these messages earlier also and found that its related with gunplot.
  Though I removed all gunplot packages and tried to upgrade I got this error again.
  I am not able to upgrade currently. Any help is really appreciated.
  Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.9
  ProcVersionSignature: Ubuntu 3.13.0-108.155-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-108-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.14.1-0ubuntu3.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Feb  5 13:47:59 2017
  InstallationDate: Installed on 2013-08-29 (1255 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2017-02-05 (0 days ago)

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