Public bug reported:

Executing the do-release-upgrade command, it ends with the following
info:

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 

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.27
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Thu Oct 25 22:07:35 2018
InstallationDate: Installed on 2017-09-08 (412 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2018-10-25 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2018-07-05T09:11:12.937488

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


** Tags: amd64 apport-bug bionic dist-upgrade

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https://bugs.launchpad.net/bugs/1800031

Title:
  Unable to upgrade xubuntu 18.04 to 18.10 with do-release-upgrade

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