Public bug reported:

when i try to upgrade my operative system, i can view the following
message:

Calculating the changes

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

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-95.142-generic 3.13.11-ckt39
Uname: Linux 3.13.0-95-generic i686
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: LXDE
Date: Sat Aug 27 02:49:17 2016
InstallationDate: Installed on 2014-03-14 (896 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release i386 (20131016.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-08-27 (0 days ago)
mtime.conffile..etc.update.manager.release.upgrades: 2014-10-26T13:13:12.989884

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug dist-upgrade i386 third-party-packages trusty

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https://bugs.launchpad.net/bugs/1617525

Title:
  upgrade OS of 14.04 to 15.10

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