impossible to upgrade to 16.04 with sudo do-release-upgrade --devel-release

[Lewillon Bruno]

Check of the administrator of packages
Reading of the lists of packages … Ended
Construction of the tree of dependences(outbuildings)
Reading of the information of state … Ended
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Calculation of the current modifications

Calculation of the current modifications

Impossible to estimate the upgrade

An insoluble problem arose during the preparation of the upgrade.

This maybe owed in:
* The upgrade towards a version of development of Ubuntu;
* The version of development of Ubuntu is at present used;
* Unofficial software packages, not supplied by Ubuntu.

If nothing of that kind does not apply, please indicate this bug by using the command(order) " ubuntu-bug ubuntu-release-upgrader-core " in a terminal.

System restore in its home state

Cancellation
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Construction of the tree of dependences(outbuildings)
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ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8 [origin: unknown]
ProcVersionSignature: Ubuntu 3.19.0-43.49~14.04.1-generic 3.19.8-ckt10
Uname: Linux 3.19.0-43-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Jan 22 21:25:52 2016
InstallationDate: Installed on 2015-11-22 (61 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-01-22 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Tannoiser (tannoiser-gmail)]

I also hit this problem with do-release-upgrade from 14.04 lts to 16.04 lts. I have no extra or ppa repository.