[Bug 1634309] [NEW] This bug arrived when I tried to run a partial upgrade

[Romulo]

Public bug reported:

I have tried to upgrade from 14.04.3 LTS to 16.04.1 LTS.
It was shown just a ~Partial Upgrade~ and I accept to try that but an error arrived.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.19.0-66.74~14.04.1-generic 3.19.8-ckt22
Uname: Linux 3.19.0-66-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Oct 17 21:55:59 2016
InstallationDate: Installed on 2016-07-28 (81 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug dist-upgrade trusty

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https://bugs.launchpad.net/bugs/1634309

Title:
  This bug arrived when I tried to run a partial upgrade

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

Bug description:
  I have tried to upgrade from 14.04.3 LTS to 16.04.1 LTS.
  It was shown just a ~Partial Upgrade~ and I accept to try that but an error arrived.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.19.0-66.74~14.04.1-generic 3.19.8-ckt22
  Uname: Linux 3.19.0-66-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Oct 17 21:55:59 2016
  InstallationDate: Installed on 2016-07-28 (81 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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