[Bug 1534571] Re: 14.04->14.10 Upgrade didn't go through due to three reasons that seem shouldn't apply

[Brian Murray]

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

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1534374, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

** 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/1534571

Title:
  14.04->14.10 Upgrade didn't go through due to three reasons that seem
  shouldn't apply

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

Bug description:
  
  Tried to upgrade from 14.04 to 14.10
  Changed /etc/update-manager/release-upgrades to have:
  Prompt=normal
  And then ran upgrade
  sudo do-release-upgrade

  Source: http://askubuntu.com/questions/614075/update-lubuntu-14-04-to-14-10
  Got error:
  "
  Checking package manager
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done
  Building data structures... Done 

  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 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. 

  
  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done
  Building data structures... Done 
  === Command terminated with exit status 1 (Fri Jan 15 06:55:49 2016) ===

  "

  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 x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Jan 15 06:53:51 2016
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-15 (0 days ago)
  modified.conffile..etc.update.manager.release.upgrades: [modified]
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-15T06:51:49.046263

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