[Bug 1572262] [NEW] Trusty to Xenial upgrade fails - Could not calculate the upgrade

[Ross Gammon]

*** This bug is a duplicate of bug 1561420 ***
    https://bugs.launchpad.net/bugs/1561420

Public bug reported:

Testing an upgrade from Trusty to Xenial fails with a "Could not
calculate the upgrade" error.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 4.2.0-35.40~14.04.1-lowlatency 4.2.8-ckt5
Uname: Linux 4.2.0-35-lowlatency x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
CurrentDmesg.txt:
 [   40.472292] init: plymouth-upstart-bridge main process ended, respawning
 [   40.684498] init: plymouth-upstart-bridge main process (1202) terminated with status 1
 [   40.684588] init: plymouth-upstart-bridge main process ended, respawning
 [   42.206548] init: plymouth-stop pre-start process (1274) terminated with status 1
Date: Tue Apr 19 20:09:08 2016
InstallationDate: Installed on 2016-02-17 (61 days ago)
InstallationMedia: Ubuntu-Studio 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160216)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-04-19 (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/1572262

Title:
  Trusty to Xenial upgrade fails - Could not calculate the upgrade

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

Bug description:
  Testing an upgrade from Trusty to Xenial fails with a "Could not
  calculate the upgrade" error.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 4.2.0-35.40~14.04.1-lowlatency 4.2.8-ckt5
  Uname: Linux 4.2.0-35-lowlatency x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  CurrentDmesg.txt:
   [   40.472292] init: plymouth-upstart-bridge main process ended, respawning
   [   40.684498] init: plymouth-upstart-bridge main process (1202) terminated with status 1
   [   40.684588] init: plymouth-upstart-bridge main process ended, respawning
   [   42.206548] init: plymouth-stop pre-start process (1274) terminated with status 1
  Date: Tue Apr 19 20:09:08 2016
  InstallationDate: Installed on 2016-02-17 (61 days ago)
  InstallationMedia: Ubuntu-Studio 14.04.4 LTS "Trusty Tahr" - Release amd64 (20160216)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-04-19 (0 days ago)
  VarLogDistupgradeTermlog:

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