after having authorized the beginning of distribution upgrade

[AttilaFlagello]

after having authorized the beginning of distribution upgrade from ubuntu 04.14 lts at to 15.10
when set new software channels, appeared error" Can not calculate the advancement". There was an unsolvable problem evaluated in the advancement.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-91.138-generic 3.13.11-ckt39
Uname: Linux 3.13.0-91-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: LXDE
Date: Mon Jul 11 06:25:43 2016
InstallationDate: Installed on 2014-06-06 (765 days ago)
InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-07-11 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update.manager.release.upgrades: 2016-07-10T14:16:04.539587