[Bug 1509976] [NEW] Crush while upgrading

[Fiston]

Public bug reported:

When trying to upgrade from ubuntu 15.04 to 15.10, it keeps failing and
giving this message:

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.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14.2
ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
Uname: Linux 3.19.0-31-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Mon Oct 26 10:07:16 2015
InstallationDate: Installed on 2015-03-31 (208 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to vivid on 2015-10-26 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade vivid

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https://bugs.launchpad.net/bugs/1509976

Title:
  Crush while upgrading

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

Bug description:
  When trying to upgrade from ubuntu 15.04 to 15.10, it keeps failing
  and giving this message:

  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.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.2
  ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-31-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Mon Oct 26 10:07:16 2015
  InstallationDate: Installed on 2015-03-31 (208 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-10-26 (0 days ago)

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