[Bug 1744590] Re: do-release-upgrade -d fails without information to resolve failure

[Brian Murray]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a conflict between
packages from the official Ubuntu archive and packages from a PPA. To
resolve this situation please deactivate PPAs using the tool 'ppa-purge'
which is provided by the ppa-purge package. Then try performing the
release upgrade again. Thanks in advance!

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

** Tags added: ppa-conflict

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https://bugs.launchpad.net/bugs/1744590

Title:
  do-release-upgrade -d fails without information to resolve failure

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

Bug description:
  attempting my distribution upgrade first time resulted in a listed dependency:
  - Hold prevents MarkGarbage of libserf1 [ amd64 ] < 1.1.0-2ubuntu1 > ( libs )

  which I then removed successfully: 
  - sudo apt remove libserf1

  re-running the distribution upgrade (do-release-upgrade -d) again still failed, but this time without any specific information about the reason:
  ----
  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 
  ----

  I expect it's most likely to be a 3rd party package.  I have no
  problem with removing any needed package and attempting reinstall
  after the upgrade, but I have no idea what package to look into.

  If someone could review the associated logs for any relevant info that
  would be really appreciated.

  In the mean time I'll reboot and retry...

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.23
  ProcVersionSignature: Ubuntu 4.4.0-109.132-generic 4.4.98
  Uname: Linux 4.4.0-109-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Jan 21 11:18:34 2018
  InstallationDate: Installed on 2014-09-05 (1233 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-01-21 (0 days ago)

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