[Bug 1531333] [NEW] error installing Unity desktop when upgrading 14.04 to 15.05

[feral_shade]

Public bug reported:

It was accompanied by an error saying a list of packages could not be authenticated.
In the bug report description, it stated part of a file had been modified, and then displayed the release upgrade options from the Software Updater.
It was accompanied by an error stating that some third party services (or something) had to be disabled.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.16.0-57.77~14.04.1-generic 3.16.7-ckt20
Uname: Linux 3.16.0-57-generic i686
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue Jan  5 17:55:05 2016
InstallationDate: Installed on 2015-07-23 (166 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release i386 (20150218.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-01-05 (0 days ago)
VarLogDistupgradeTermlog:
 
mtime.conffile..etc.update.manager.release.upgrades: 2016-01-01T07:42:42.451084

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


** Tags: apport-bug dist-upgrade i386 third-party-packages trusty

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https://bugs.launchpad.net/bugs/1531333

Title:
  error installing Unity desktop when upgrading 14.04 to 15.05

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

Bug description:
  It was accompanied by an error saying a list of packages could not be authenticated.
  In the bug report description, it stated part of a file had been modified, and then displayed the release upgrade options from the Software Updater.
  It was accompanied by an error stating that some third party services (or something) had to be disabled.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.16.0-57.77~14.04.1-generic 3.16.7-ckt20
  Uname: Linux 3.16.0-57-generic i686
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Tue Jan  5 17:55:05 2016
  InstallationDate: Installed on 2015-07-23 (166 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release i386 (20150218.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-01-05 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2016-01-01T07:42:42.451084

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