[Bug 1535475] Re: An unresolvable problem occurred from 14.04 to 15.10

[Brian Murray]

*** This bug is a duplicate of bug 1534374 ***
    https://bugs.launchpad.net/bugs/1534374

** This bug has been marked a duplicate of bug 1534374
   unable to upgrade to 15.04 due to libstdc++6 SRU

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https://bugs.launchpad.net/bugs/1535475

Title:
  An unresolvable problem occurred from 14.04 to 15.10

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

Bug description:
  1.  installed 12.04 and upgraded to 14.04 successfully

  (1.1 remove unity install gnome, due to unrelated reason)

  2. Change upgrade-manager from "long term releases only" to "any
  release"

  3. add

  4. do-release-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. "

  This shouldn't be right:
  * it's not a prerelease version - it's 14.04 the LTS version
  * It's upgrading to a version that has been stable for quite some time
  * there shouldn't be any packages that aren't provided by ubuntu - it's pretty close to only what was running on 12.04 for that particular upgrade

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
  Uname: Linux 3.13.0-74-generic i686
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CrashDB: ubuntu
  Date: Mon Jan 18 17:10:04 2016
  InstallationDate: Installed on 2016-01-16 (2 days ago)
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release i386 (20130213)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-18 (0 days ago)
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-18T17:00:47.220347

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