Upgrade from Kubuntu 14.04 to 16.04 crashed

[Fernando Selles]

When upgrading from Kubuntu 14.04 to 16.04 installer displayed message:
"Can't install 'kubuntu-desktop'
It was impossible to install a required package. Please report a bug using
'ubuntu-bug ubuntu-release-upgrader-core' in a terminal"

details were sent when using the commands above

Description: Ubuntu 14.04.4 LTS
Release: 14.04
OS Version Linux 4.2.0-42-generic
KDE SC Version 4.14.13
Processor AMD Athlon(tm) 64 X2 Dual Core Processor 4600+

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 4.2.0-42.49~14.04.1-generic 4.2.8-ckt12
Uname: Linux 4.2.0-42-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Sat Jul 30 21:07:42 2016
InstallationDate: Installed on 2015-01-10 (568 days ago)
InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-07-30 (0 days ago)
VarLogDistupgradeTermlog: