[Bug 1533908] Re: error when upgrading from v14.04 to v15 -- always receiving msg panel stating: "Could not calculate the upgrade". None of the 3 causes listed 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/1533908

Title:
  error when upgrading from v14.04 to v15 -- always receiving msg panel
  stating:  "Could not calculate the upgrade".  None of the 3 causes
  listed apply

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

Bug description:
  have attempted the upgrade every 2-3 days for the past two weeks.
  have applied other maintenance than was available.   this is a simple,
  unmodified Ubuntu 14.04 image installed from the Ubuntu site download
  in Dec, 2015.  Operating on a Lenovo T500 laptop.

  Ubuntu 14.04.3 LTS  release 14.04

  I get the exact same error each time.   First a warning message that
  "some download sources are disabled" (no info about which sources and
  I only use the options of the SW installer).   Then upgrade proceeds
  until the "Unable to Calculate" panel is given.  Then the upgrade
  process is backed-out.

  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: Wed Jan 13 16:13:15 2016
  InstallationDate: Installed on 2014-07-05 (557 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-14 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-01T12:41:32.353555

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