[Bug 1622329] Re: Ubuntu 14.04.5 LTS upgrade to 16 fails via Software Updater

[Brian Murray]

*** This bug is a duplicate of bug 1384946 ***
    https://bugs.launchpad.net/bugs/1384946

** This bug has been marked a duplicate of bug 1384946
   Trying to upgrade to utopic, cannot compute changes due to gnuplot

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https://bugs.launchpad.net/bugs/1622329

Title:
  Ubuntu 14.04.5 LTS upgrade to 16 fails via Software Updater

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

Bug description:
  On the attempt to upgrade Ubuntu 14 to 16 via the Software Updater the
  following dialog window appears:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This can be caused by:
   * Upgrading to a pre-release version of Ubuntu
   * Running the current pre-release version of Ubuntu
   * Unofficial software packages not provided by Ubuntu

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

  
  This dialog appears on the second step of the upgrade:
  Preparing to upgrade  [OK]
  Setting new software channels  <- Fails
  ...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-95.142-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-95-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Sep 11 13:57:14 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-10-25 (686 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 2016-09-11 (0 days ago)
  VarLogDistupgradeTermlog:

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