Canno distro upgrade my Ubuntu Studio 14.04 to 16.04. It is constant problem.

[Daniel]

During distro upgrade from 14.04 (Ubuntu Studio) to 16.04 upgrade is canceled.
Should work seamlessly.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.9
ProcVersionSignature: Ubuntu 3.13.0-121.170-generic 3.13.11-ckt39
Uname: Linux 3.13.0-121-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.24
Architecture: amd64
CrashDB: ubuntu
Date: Tue Jun 20 17:03:25 2017
InstallationDate: Installed on 2014-06-20 (1096 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=pl_PL
 TERM=xterm
 PATH=(custom, no user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2017-06-20 (0 days ago)
VarLogDistupgradeTermlog: