[Bug 1623334] [NEW] Unable to upgrade to Ubuntu 16.04 from 15.10

[Jon]

Public bug reported:

I was trying to upgrade to Ubuntu 16.04 from 15.10 but received the
"Could not calculate the upgrade" error and was unable to complete the
upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-42.49-generic 4.2.8-ckt12
Uname: Linux 4.2.0-42-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Tue Sep 13 22:33:41 2016
InstallationDate: Installed on 2015-11-22 (296 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-09-14 (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/1623334

Title:
  Unable to upgrade to Ubuntu 16.04 from 15.10

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

Bug description:
  I was trying to upgrade to Ubuntu 16.04 from 15.10 but received the
  "Could not calculate the upgrade" error and was unable to complete the
  upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-42.49-generic 4.2.8-ckt12
  Uname: Linux 4.2.0-42-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Tue Sep 13 22:33:41 2016
  InstallationDate: Installed on 2015-11-22 (296 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-09-14 (0 days ago)
  VarLogDistupgradeTermlog:

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