[Bug 1536910] Re: Upgrading from 14.04 to 15.04 fails on calculating upgrade

[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/1536910

Title:
  Upgrading from 14.04 to 15.04 fails on calculating upgrade

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

Bug description:
  When trying to upgrade Ubuntu either through the terminal (sudo do-
  release-upgrade) or through the software updater, it will fail just
  after starting saying that "An unresolvable error occurred while
  calculating the upgrade" and it can't continue.

  The error I got is this: 
  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. 

  I've looked around for a solution, but I couldn't find any so I'm
  reporting it. I don't know if duelbooting Windows 10 on the same drive
  could potentially do something, but that's why I'm reporting this bug.
  Looking at the upgrade log files (/var/log/dist-upgrade/main.log), I
  noticed that close to the end it errors on trying to run
  SystemUnLock() and fails as it is already unlocked (I'm just typing
  what it said).

  1) Release version: 14.04.3 LTS Trusty Tahr
  2) Version of package: 1.0.220.8
  3) What I expected to happen: The upgrade process to continue normally.
  4) What happened instead: The upgrade failed and notified without much information.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-76.120-generic 3.13.11-ckt30
  Uname: Linux 3.13.0-76-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Jan 22 07:42:06 2016
  InstallationDate: Installed on 2015-01-20 (366 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-22 (0 days ago)
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-21T21:18:22.748253

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