[Bug 1741482] Re: do-release upgrade fails from trusty to xenial

[Ubuntu Foundations Team Bug Bot]

** Tags added: trusty2xenial

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https://bugs.launchpad.net/bugs/1741482

Title:
  do-release upgrade fails from trusty to xenial

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

Bug description:
  When running do-release-upgrade:

  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 

  
  $ cat /var/log/dist-upgrade/main.log | grep ERROR
  2018-01-05 14:51:21,346 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'

  $ grep Broken /var/log/dist-upgrade/apt.log | wc
      617    9846   72781

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.9
  ProcVersionSignature: Ubuntu 4.4.0-104.127~14.04.1-generic 4.4.98
  Uname: Linux 4.4.0-104-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.14.1-0ubuntu3.27
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Jan  5 14:46:47 2018
  InstallationDate: Installed on 2017-01-05 (365 days ago)
  InstallationMedia: It
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2018-01-05 (0 days ago)

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