[Bug 1594355] [NEW] Upgrade from 15.10 to 16.04 stopped during new repository configuration

[Flaburgan]

Public bug reported:

A error message appeared saying the upgrade cannot continue and will
stop, asking me to report this problem with `ubuntu-bug ubuntu-release-
upgrader-core`.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-38.45-generic 4.2.8-ckt10
Uname: Linux 4.2.0-38-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Jun 20 14:40:13 2016
InstallationDate: Installed on 2015-10-05 (258 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-06-20 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1594355

Title:
  Upgrade from 15.10 to 16.04 stopped during new repository
  configuration

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

Bug description:
  A error message appeared saying the upgrade cannot continue and will
  stop, asking me to report this problem with `ubuntu-bug ubuntu-
  release-upgrader-core`.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-38.45-generic 4.2.8-ckt10
  Uname: Linux 4.2.0-38-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Jun 20 14:40:13 2016
  InstallationDate: Installed on 2015-10-05 (258 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-06-20 (0 days ago)
  VarLogDistupgradeTermlog:

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