[Bug 1762828] Re: Upgrade failing, unable to determine reason

[Ubuntu Foundations Team Bug Bot]

** Tags added: zesty2artful

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https://bugs.launchpad.net/bugs/1762828

Title:
  Upgrade failing, unable to determine reason

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

Bug description:
  Despite Googling and trying everything I could find, persistently
  fails to 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. 
  "

  Only Error line in log, the rest are debug messages.

  "2018-04-10 21:28:55,829 ERROR Dist-upgrade failed: 'E:Error,
  pkgProblemResolver::Resolve generated breaks, this may be caused by
  held packages.'"

  dpkg --get-selections | grep hold

  Shows no held packages.
  Have done :

  sudo apt dist-upgrade
  sudo apt upgrade
  sudo apt autoremove
  sudo apt clean

  Still nothing.

  So at a loss, hence reporting.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: ubuntu-release-upgrader-core 1:17.04.10
  ProcVersionSignature: Ubuntu 4.10.0-42.46-generic 4.10.17
  Uname: Linux 4.10.0-42-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4.10
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7
  Date: Tue Apr 10 18:45:32 2018
  InstallationDate: Installed on 2014-05-14 (1426 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to zesty on 2018-04-10 (0 days ago)
  VarLogDistupgradeTermlog:

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