[Bug 1612947] [NEW] ubuntu upgrade to 16 gives 'could not calculate upgrade' error at the step 'setting up new software channels'

[Pinar Demetci]

Public bug reported:

While upgrading to Ubuntu 16.04.1, at the step "setting up new software
channels', I received an error saying 'could not calculate upgrade'. It
gave 3 possible reasons for this, 2 of which I remember: -upgrading a
pre-release version, -running a current pre-release version, and a third
one I don't remember.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-87.133-generic 3.13.11-ckt39
Uname: Linux 3.13.0-87-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sat Aug 13 15:21:12 2016
InstallationDate: Installed on 2015-01-27 (563 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-08-13 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1612947

Title:
  ubuntu upgrade to 16 gives 'could not calculate upgrade' error at the
  step 'setting up new software channels'

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

Bug description:
  While upgrading to Ubuntu 16.04.1, at the step "setting up new
  software channels', I received an error saying 'could not calculate
  upgrade'. It gave 3 possible reasons for this, 2 of which I remember:
  -upgrading a pre-release version, -running a current pre-release
  version, and a third one I don't remember.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-87.133-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-87-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Aug 13 15:21:12 2016
  InstallationDate: Installed on 2015-01-27 (563 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-13 (0 days ago)
  VarLogDistupgradeTermlog:

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