[Bug 1510016] Re: Cannot upgrade to Ubuntu 15.10 (Could not calculate the upgrade)

[Brian Murray]

As you've discovered it is not enough to just disable PPAs as the those
PPAs may have provided package version numbers greater than the versions
in the release to which you are trying to upgrade. This then can cause
problems for the release upgrade calculation. For future reference there
is a tool called ppa-purge which will disable PPAs and downgrade package
versions to those from the official Ubuntu archive.

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

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https://bugs.launchpad.net/bugs/1510016

Title:
  Cannot upgrade to Ubuntu 15.10 (Could not calculate the upgrade)

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

Bug description:
  I have Ubuntu 15.04 installed, with three PPAs enabled (Cinnamon
  Stable, Oracle Java and Google's tlk plugin).

  I tried to upgrade to Ubuntu 15.10, and during the upgrade process I
  got the "Could not calculate the upgrade" error. Disabling the PPAs
  didn't help.

  Looking into /var/log/dist-upgrade/main.log I saw an error with the
  package unity. As I use cinnamon as my DM, I just uninstalled unity.
  But now there is a similar error with update-manager, which I cannot
  uninstall, as I need that one for the upgrade.

  This is the current error shown:

  2015-10-26 10:45:12,421 ERROR Dist-upgrade failed: 'The package
  'update-manager' is marked for removal but it is in the removal
  blacklist.'

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.2
  Uname: Linux 4.0.4-040004-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: X-Cinnamon
  Date: Mon Oct 26 10:45:09 2015
  InstallationDate: Installed on 2014-02-15 (617 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140203)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-10-26 (0 days ago)
  VarLogDistupgradeTermlog:

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