[Bug 1613317] [NEW] Unable to upgrade to 16.04 Xenial Xerus, upgrade process rejected on "unable to disable sources" or similar.

[Tchalvak]

Public bug reported:

I was prompted with a request to upgrade to 16.04 from 14.04, and I
agreed.  It downloaded the files for step 1, and then failed on the
second listed step.  The failure message suggested filing a bug against
the release upgrader via `ubuntu-bug ubuntu-release-upgrader-core` and I
did, and here we are.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39
Uname: Linux 3.13.0-93-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Aug 15 10:42:33 2016
InstallationDate: Installed on 2012-09-04 (1440 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-08-15 (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/1613317

Title:
  Unable to upgrade to 16.04 Xenial Xerus, upgrade process rejected on
  "unable to disable sources" or similar.

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

Bug description:
  I was prompted with a request to upgrade to 16.04 from 14.04, and I
  agreed.  It downloaded the files for step 1, and then failed on the
  second listed step.  The failure message suggested filing a bug
  against the release upgrader via `ubuntu-bug ubuntu-release-upgrader-
  core` and I did, and here we are.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-93.140-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-93-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Aug 15 10:42:33 2016
  InstallationDate: Installed on 2012-09-04 (1440 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2016-08-15 (0 days ago)
  VarLogDistupgradeTermlog:

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