[Bug 1594355] Re: Upgrade from 15.10 to 16.04 stopped during new repository configuration

[Flaburgan]

Here is the PPA I have activated. Does anyone know which one is causing
trouble?

ls -l /etc/apt/sources.list.d/
total 20
-rw-r--r-- 1 root root 130 jun 21 10:02 atareao-ubuntu-atareao-wily.list
-rw-r--r-- 1 root root 130 jun 21 09:59 atareao-ubuntu-atareao-wily.list.distUpgrade
-rw-r--r-- 1 root root 111 jun 21 10:02 pgdg.list
-rw-r--r-- 1 root root 111 jun 21 09:59 pgdg.list.distUpgrade
-rw-r--r-- 1 root root 111 avr  8 11:34 pgdg.list.save
-rw-r--r-- 1 root root   0 jan 14 11:37 stk-ubuntu-dev-wily.list
-rw-r--r-- 1 root root   0 jan 14 11:37 stk-ubuntu-dev-wily.list.save


** Summary changed:

- Upgrade from 15.10 to 16.04 stopped during new repository configuration
+ Upgrade from 15.10 to 16.04: Could not calculate the upgrade

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https://bugs.launchpad.net/bugs/1594355

Title:
  Upgrade from 15.10 to 16.04: Could not calculate the upgrade

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

Bug description:
  The system asked me for an upgrade, I accepted.

  I first had this information message:
  ```
  Third party sources disabled

  Some third party entries in your sources.list were disabled. You can re-enable them after the upgrade with the 'software-properties' tool or your package manager.
  ```

  I validated the popup and the upgrade started but then I had this
  message:

  ```
  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.
  ```

  I never used a pre-release of Ubuntu and I'm not upgrading to a pre-
  release. I don't know how to check what "unofficial package" I have
  and which could cause that. My /etc/apt/sources.list looks clean:

  ```
  # deb cdrom:[Ubuntu 15.04 _Vivid Vervet_ - Release amd64 (20150422)]/ vivid main restricted

  # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
  # newer versions of the distribution.
  deb http://fr.archive.ubuntu.com/ubuntu/ wily main restricted
  deb-src http://fr.archive.ubuntu.com/ubuntu/ wily main restricted

  ## Major bug fix updates produced after the final release of the
  ## distribution.
  deb http://fr.archive.ubuntu.com/ubuntu/ wily-updates main restricted
  deb-src http://fr.archive.ubuntu.com/ubuntu/ wily-updates main restricted

  ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
  ## team. Also, please note that software in universe WILL NOT receive any
  ## review or updates from the Ubuntu security team.
  deb http://fr.archive.ubuntu.com/ubuntu/ wily universe
  deb-src http://fr.archive.ubuntu.com/ubuntu/ wily universe
  deb http://fr.archive.ubuntu.com/ubuntu/ wily-updates universe
  deb-src http://fr.archive.ubuntu.com/ubuntu/ wily-updates universe

  ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
  ## team, and may not be under a free licence. Please satisfy yourself as to
  ## your rights to use the software. Also, please note that software in
  ## multiverse WILL NOT receive any review or updates from the Ubuntu
  ## security team.
  deb http://fr.archive.ubuntu.com/ubuntu/ wily multiverse
  deb-src http://fr.archive.ubuntu.com/ubuntu/ wily multiverse
  deb http://fr.archive.ubuntu.com/ubuntu/ wily-updates multiverse
  deb-src http://fr.archive.ubuntu.com/ubuntu/ wily-updates multiverse

  ## N.B. software from this repository may not have been tested as
  ## extensively as that contained in the main release, although it includes
  ## newer versions of some applications which may provide useful features.
  ## Also, please note that software in backports WILL NOT receive any review
  ## or updates from the Ubuntu security team.
  deb http://fr.archive.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse
  deb-src http://fr.archive.ubuntu.com/ubuntu/ wily-backports main restricted universe multiverse

  deb http://security.ubuntu.com/ubuntu wily-security main restricted
  deb-src http://security.ubuntu.com/ubuntu wily-security main restricted
  deb http://security.ubuntu.com/ubuntu wily-security universe
  deb-src http://security.ubuntu.com/ubuntu wily-security universe
  deb http://security.ubuntu.com/ubuntu wily-security multiverse
  deb-src http://security.ubuntu.com/ubuntu wily-security multiverse

  ## Uncomment the following two lines to add software from Canonical's
  ## 'partner' repository.
  ## This software is not part of Ubuntu, but is offered by Canonical and the
  ## respective vendors as a service to Ubuntu users.
  deb http://archive.canonical.com/ubuntu wily partner
  # deb-src http://archive.canonical.com/ubuntu vivid partner
  ```

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-38.45-generic 4.2.8-ckt10
  Uname: Linux 4.2.0-38-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Mon Jun 20 14:40:13 2016
  InstallationDate: Installed on 2015-10-05 (258 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-06-20 (0 days ago)
  VarLogDistupgradeTermlog:

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