impossible to install a required package during 14.04 partial update

[vmerlet]

During 14.04 partial update, I encountered the following error :

Can't install 'ubuntu-desktop'

It was impossible to install a required package. Please report this as a bug using 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

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

This is most likely a transient problem, please try again later.

I tried updating through Synaptic and it worked ! Maybe a different dependency solver ?

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.216
Uname: Linux 3.14.0-031400rc6-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Mar 14 01:17:45 2014
InstallationDate: Installed on 2011-05-15 (1033 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2014-02-06 (35 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

Actually this isn't a duplicate of bug 1286161. The relevant log file here is VarLogDistupgradeAptlog.txt.

[Launchpad Janitor (janitor)]

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