[Bug 1512195] [NEW] trying to upgrade to 15.10 from 15.04 but failed

[Eddie]

Public bug reported:

unable to calculate the source

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubuntu-release-upgrader-core 1:15.04.14.3
ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
Uname: Linux 3.19.0-31-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.7
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Mon Nov  2 10:24:07 2015
InstallationDate: Installed on 2015-07-10 (115 days ago)
InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to vivid on 2015-11-02 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade third-party-packages vivid

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https://bugs.launchpad.net/bugs/1512195

Title:
  trying to upgrade to 15.10 from 15.04 but failed

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

Bug description:
  unable to calculate the source

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ubuntu-release-upgrader-core 1:15.04.14.3
  ProcVersionSignature: Ubuntu 3.19.0-31.36-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-31-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Mon Nov  2 10:24:07 2015
  InstallationDate: Installed on 2015-07-10 (115 days ago)
  InstallationMedia: Ubuntu-MATE 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to vivid on 2015-11-02 (0 days ago)
  VarLogDistupgradeTermlog:

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