[Bug 1577094] [NEW] Unable to upgrade Ubuntu to 16.04 (from 15.10)

[szabie]

Public bug reported:

Error message (translated from Hungarian):

Preparing upgrade is unsuccessful.

There is a problem during upgrade that cannot be solved.

This can be caused by the followings:
- upgrade to a pre-release version
- running a pre-release version of Ubuntu
- Non official packages, that are not supplied by Ubuntu  

Computer has an almost fresh install of 15.10 ( ~1-2 month old)

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
Uname: Linux 4.2.0-35-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sun May  1 06:39:31 2016
InstallationDate: Installed on 2016-03-05 (56 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-05-01 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade third-party-packages wily

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https://bugs.launchpad.net/bugs/1577094

Title:
  Unable to upgrade Ubuntu to 16.04 (from 15.10)

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

Bug description:
  Error message (translated from Hungarian):

  Preparing upgrade is unsuccessful.

  There is a problem during upgrade that cannot be solved.

  This can be caused by the followings:
  - upgrade to a pre-release version
  - running a pre-release version of Ubuntu
  - Non official packages, that are not supplied by Ubuntu  

  Computer has an almost fresh install of 15.10 ( ~1-2 month old)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: ubuntu-release-upgrader-core 1:15.10.14.4
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun May  1 06:39:31 2016
  InstallationDate: Installed on 2016-03-05 (56 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to wily on 2016-05-01 (0 days ago)
  VarLogDistupgradeTermlog:

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