Public bug reported:

sudo do-release-upgrade
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]                                           
Get:2 Upgrade tool [1,258 kB]                                                  
Fetched 1,259 kB in 0s (0 B/s)                                                 
authenticate 'bionic.tar.gz' against 'bionic.tar.gz.gpg' 
extracting 'bionic.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Hit http://us.archive.ubuntu.com/ubuntu xenial InRelease                       
Hit http://security.ubuntu.com/ubuntu xenial-security InRelease                
Hit http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease               
Hit http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease             
Hit http://dl.ubnt.com/unifi/debian stable InRelease                           
Fetched 0 B in 0s (0 B/s)                                                      
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Updating repository information

Third party sources disabled

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]

Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [83.2 kB]    
Get:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease [242 kB]            
Get:3 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]   
Get:4 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB] 
Get:5 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 
[159 kB]
Get:6 http://security.ubuntu.com/ubuntu bionic-security/main i386 Packages [128 
kB]
Get:7 http://security.ubuntu.com/ubuntu bionic-security/main Translation-en 
[60.9 kB]
Get:8 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1,019 kB]
Get:9 http://security.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11 
Metadata [204 B]
Get:10 http://security.ubuntu.com/ubuntu bionic-security/main DEP-11 64x64 
Icons [29 B]
Get:11 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 
Packages [57.0 kB]
Get:12 http://security.ubuntu.com/ubuntu bionic-security/universe i386 Packages 
[56.9 kB]
Get:13 http://security.ubuntu.com/ubuntu bionic-security/universe 
Translation-en [33.6 kB]
Get:14 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11 
Metadata [6,820 B]
Get:15 http://security.ubuntu.com/ubuntu bionic-security/universe DEP-11 64x64 
Icons [11.3 kB]
Get:16 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 
Packages [1,444 B]
Get:17 http://security.ubuntu.com/ubuntu bionic-security/multiverse i386 
Packages [1,608 B]
Get:18 http://security.ubuntu.com/ubuntu bionic-security/multiverse 
Translation-en [996 B]
Get:19 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages [1,007 kB]
Get:20 http://us.archive.ubuntu.com/ubuntu bionic/main Translation-en [516 kB] 
Get:21 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 DEP-11 Metadata 
[477 kB]
Get:22 http://us.archive.ubuntu.com/ubuntu bionic/main DEP-11 64x64 Icons [245 
kB]
Get:23 http://us.archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages 
[9,184 B]
Get:24 http://us.archive.ubuntu.com/ubuntu bionic/restricted i386 Packages 
[9,156 B]
Get:25 http://us.archive.ubuntu.com/ubuntu bionic/restricted Translation-en 
[3,584 B]
Get:26 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 
[8,570 kB]
Get:27 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages [8,531 
kB]
Get:28 http://us.archive.ubuntu.com/ubuntu bionic/universe Translation-en 
[4,941 kB]
Get:29 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 DEP-11 
Metadata [3,287 kB]
Get:30 http://us.archive.ubuntu.com/ubuntu bionic/universe DEP-11 64x64 Icons 
[8,420 kB]
Get:31 http://us.archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages 
[151 kB]
Get:32 http://us.archive.ubuntu.com/ubuntu bionic/multiverse i386 Packages [144 
kB]
Get:33 http://us.archive.ubuntu.com/ubuntu bionic/multiverse Translation-en 
[108 kB]
Get:34 http://us.archive.ubuntu.com/ubuntu bionic/multiverse amd64 DEP-11 
Metadata [49.7 kB]
Get:35 http://us.archive.ubuntu.com/ubuntu bionic/multiverse DEP-11 64x64 Icons 
[225 kB]
Get:36 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 
[304 kB]
Get:37 http://us.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages 
[272 kB]
Get:38 http://us.archive.ubuntu.com/ubuntu bionic-updates/main Translation-en 
[115 kB]
Get:39 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 
Metadata [138 kB]
Get:40 http://us.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64 
Icons [53.7 kB]
Get:41 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 
Packages [172 kB]
Get:42 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe i386 
Packages [173 kB]
Get:43 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe 
Translation-en [80.0 kB]
Get:44 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 
Metadata [153 kB]
Get:45 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64 
Icons [258 kB]
Get:46 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 
Packages [3,772 B]
Get:47 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse i386 
Packages [3,928 B]
Get:48 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse 
Translation-en [2,376 B]
Get:49 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 
DEP-11 Metadata [2,468 B]
Get:50 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse DEP-11 
64x64 Icons [2,638 B]
Get:51 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 
Packages [2,704 B]
Get:52 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe i386 
Packages [2,704 B]
Get:53 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe 
Translation-en [1,136 B]
Get:54 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 
DEP-11 Metadata [5,100 B]
Get:55 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 
64x64 Icons [1,789 B]
Fetched 40.5 MB in 0s (0 B/s)                                                  

(appstreamcli:4870): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:4870): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:4870): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:4870): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:4870): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:4870): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL' 
failed
AppStream cache update completed, but some metadata was ignored due to errors.

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

Calculating the changes

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. 


Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Description:    Ubuntu 16.04.5 LTS
Release:        16.04

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-134.160-generic 4.4.140
Uname: Linux 4.4.0-134-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Aug 29 19:40:53 2018
InstallationDate: Installed on 2013-03-16 (1992 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 
(20130213)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-08-29 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/1789761

Title:
  An unresolvable problem occurred while calculating the upgrad

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