Public bug reported:

After making sure my system is up-to-date, I ran the upgrade tool and
got the following when "Setting new software channels":

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.

I got some details of my system in case they were useful.

Linux UbuntuMS 4.4.0-135-generic #161-Ubuntu SMP Mon Aug 27 10:45:01 UTC
2018 x86_64 x86_64 x86_64 GNU/Linux

Distributor ID: Ubuntu
Description:    Ubuntu 16.04.5 LTS
Release:        16.04
Codename:       xenial

When running sudo apt update, I get the following:

Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease                    
                                                           
Err:3 http://archive.getdeb.net/ubuntu xenial-getdeb InRelease                  
                                                           
  Could not resolve 'archive.getdeb.net'
Hit:4 http://gb.archive.ubuntu.com/ubuntu xenial InRelease                      
                                                           
Hit:5 http://ppa.launchpad.net/diesch/testing/ubuntu xenial InRelease           
                                                           
Ign:6 http://apt.izzysoft.de/ubuntu generic InRelease                           
                                                           
Hit:7 http://gb.archive.ubuntu.com/ubuntu xenial-updates InRelease              
                                                           
Hit:8 http://dl.google.com/linux/chrome/deb stable Release                      
                                                           
Hit:10 http://gb.archive.ubuntu.com/ubuntu xenial-backports InRelease           
                                                           
Hit:11 http://ppa.launchpad.net/freyja-dev/unity-tweak-tool-daily/ubuntu xenial 
InRelease                                                  
Hit:12 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial InRelease    
                                                           
Hit:13 http://ppa.launchpad.net/numix/ppa/ubuntu xenial InRelease               
                                                           
Hit:14 http://us.archive.ubuntu.com/ubuntu xenial InRelease                     
                                         
Hit:15 http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease              
                                         
Hit:16 http://ppa.launchpad.net/snwh/pulp/ubuntu xenial InRelease               
                   
Hit:17 http://repo.zabbix.com/zabbix/3.4/ubuntu xenial InRelease                
                   
Hit:18 http://ppa.launchpad.net/team-xbmc/ppa/ubuntu xenial InRelease           
                   
Hit:19 http://ppa.launchpad.net/teejee2008/ppa/ubuntu xenial InRelease       
Hit:20 http://ppa.launchpad.net/yktooo/ppa/ubuntu xenial InRelease           
Hit:9 https://apt.izzysoft.de/ubuntu generic Release
Reading package lists... Done 
W: Failed to fetch 
http://archive.getdeb.net/ubuntu/dists/xenial-getdeb/InRelease  Could not 
resolve 'archive.getdeb.net'
W: Some index files failed to download. They have been ignored, or old ones 
used instead.

I tried running the upgrade via Terminal and got this:

Some third party entries in your sources.list were disabled. You can 
re-enable them after the upgrade with the 'software-properties' tool 
or your package manager. 

To continue please press [ENTER]

Hit http://security.ubuntu.com/ubuntu bionic-security InRelease                 
                                                           
Hit http://gb.archive.ubuntu.com/ubuntu bionic InRelease                        
                                                           
Hit http://gb.archive.ubuntu.com/ubuntu bionic-updates InRelease                
                                                           
Hit http://gb.archive.ubuntu.com/ubuntu bionic-backports InRelease              
                                                           
Hit http://us.archive.ubuntu.com/ubuntu bionic InRelease                        
                                                           
Fetched 0 B in 0s (0 B/s)        <<<< LOOKS LIKE IT HASN'T DOWNLOADED THE 
FILES!                                                                          
                                

Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Calculating the changes

Calculating the changes

Could not determine 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. 


Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done
=== Command detached from window (Sun Sep 23 12:55:45 2018) ===
=== Command terminated with exit status 1 (Sun Sep 23 12:55:55 2018) ===

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
Uname: Linux 4.4.0-135-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Sun Sep 23 12:41:28 2018
InstallationDate: Installed on 2016-05-15 (860 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-09-23 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial

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https://bugs.launchpad.net/bugs/1793949

Title:
  Could not determine the upgrade - 16.04 > 18.04

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