Public bug reported:

Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]                                           
Get:2 Upgrade tool [1.242 kB]                                                  
Fetched 1.243 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://security.ubuntu.com/ubuntu xenial-security InRelease                
Hit http://us.archive.ubuntu.com/ubuntu xenial InRelease                       
Hit http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease               
Hit http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease             
Fetched 0 B in 0s (0 B/s)                                                      
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Updating repository information
Get:1 http://security.ubuntu.com/ubuntu bionic-security InRelease [88,7 kB]    
Get:2 http://us.archive.ubuntu.com/ubuntu bionic InRelease [242 kB]            
Get:3 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages 
[707 kB]
Get:4 http://us.archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB]   
Get:5 http://us.archive.ubuntu.com/ubuntu bionic-backports InRelease [74,6 kB] 
Get:6 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages [1.019 kB]
Get:7 http://security.ubuntu.com/ubuntu bionic-security/main i386 Packages [464 
kB]
Get:8 http://security.ubuntu.com/ubuntu bionic-security/main Translation-en 
[224 kB]
Get:9 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages [1.007 kB] 
Get:10 http://security.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11 
Metadata [38,7 kB]
Get:11 http://security.ubuntu.com/ubuntu bionic-security/main DEP-11 64x64 
Icons [46,0 kB]
Get:12 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 
Packages [660 kB]
Get:13 http://us.archive.ubuntu.com/ubuntu bionic/main Translation-en [516 kB] 
Get:14 http://security.ubuntu.com/ubuntu bionic-security/universe i386 Packages 
[619 kB]
Get:15 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 DEP-11 Metadata 
[477 kB]
Get:16 http://us.archive.ubuntu.com/ubuntu bionic/main DEP-11 64x64 Icons [245 
kB]
Get:17 http://security.ubuntu.com/ubuntu bionic-security/universe 
Translation-en [219 kB]
Get:18 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 
[8.570 kB]
Get:19 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11 
Metadata [42,0 kB]
Get:20 http://security.ubuntu.com/ubuntu bionic-security/universe DEP-11 64x64 
Icons [103 kB]
Get:21 http://security.ubuntu.com/ubuntu bionic-security/restricted amd64 
Packages [40,3 kB]
Get:22 http://security.ubuntu.com/ubuntu bionic-security/restricted i386 
Packages [4.280 B]
Get:23 http://security.ubuntu.com/ubuntu bionic-security/restricted 
Translation-en [10,2 kB]
Get:24 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 
Packages [7.392 B]
Get:25 http://security.ubuntu.com/ubuntu bionic-security/multiverse i386 
Packages [4.288 B]
Get:26 http://security.ubuntu.com/ubuntu bionic-security/multiverse 
Translation-en [2.788 B]
Get:27 http://security.ubuntu.com/ubuntu bionic-security/multiverse amd64 
DEP-11 Metadata [2.464 B]
Get:28 http://security.ubuntu.com/ubuntu bionic-security/multiverse DEP-11 
64x64 Icons [2.638 B]
Get:29 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages [8.531 
kB]
Get:30 http://us.archive.ubuntu.com/ubuntu bionic/universe Translation-en 
[4.941 kB]
Get:31 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 DEP-11 
Metadata [3.287 kB]
Get:32 http://us.archive.ubuntu.com/ubuntu bionic/universe DEP-11 64x64 Icons 
[8.420 kB]
Get:33 http://us.archive.ubuntu.com/ubuntu bionic/restricted amd64 Packages 
[9.184 B]
Get:34 http://us.archive.ubuntu.com/ubuntu bionic/restricted i386 Packages 
[9.156 B]
Get:35 http://us.archive.ubuntu.com/ubuntu bionic/restricted Translation-en 
[3.584 B]
Get:36 http://us.archive.ubuntu.com/ubuntu bionic/multiverse amd64 Packages 
[151 kB]
Get:37 http://us.archive.ubuntu.com/ubuntu bionic/multiverse i386 Packages [144 
kB]
Get:38 http://us.archive.ubuntu.com/ubuntu bionic/multiverse Translation-en 
[108 kB]
Get:39 http://us.archive.ubuntu.com/ubuntu bionic/multiverse amd64 DEP-11 
Metadata [49,7 kB]
Get:40 http://us.archive.ubuntu.com/ubuntu bionic/multiverse DEP-11 64x64 Icons 
[225 kB]
Get:41 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 
[932 kB]
Get:42 http://us.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages 
[675 kB]
Get:43 http://us.archive.ubuntu.com/ubuntu bionic-updates/main Translation-en 
[318 kB]
Get:44 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 
Metadata [301 kB]
Get:45 http://us.archive.ubuntu.com/ubuntu bionic-updates/main DEP-11 64x64 
Icons [145 kB]
Get:46 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 
Packages [1.068 kB]
Get:47 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe i386 
Packages [1.014 kB]
Get:48 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe 
Translation-en [332 kB]
Get:49 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 
Metadata [273 kB]
Get:50 http://us.archive.ubuntu.com/ubuntu bionic-updates/universe DEP-11 64x64 
Icons [458 kB]
Get:51 http://us.archive.ubuntu.com/ubuntu bionic-updates/restricted amd64 
Packages [50,1 kB]
Get:52 http://us.archive.ubuntu.com/ubuntu bionic-updates/restricted i386 
Packages [9.808 B]
Get:53 http://us.archive.ubuntu.com/ubuntu bionic-updates/restricted 
Translation-en [12,6 kB]
Get:54 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 
Packages [15,5 kB]
Get:55 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse i386 
Packages [8.728 B]
Get:56 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse 
Translation-en [6.352 B]
Get:57 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse amd64 
DEP-11 Metadata [2.464 B]
Get:58 http://us.archive.ubuntu.com/ubuntu bionic-updates/multiverse DEP-11 
64x64 Icons [2.638 B]
Get:59 http://us.archive.ubuntu.com/ubuntu bionic-backports/main amd64 Packages 
[7.516 B]
Get:60 http://us.archive.ubuntu.com/ubuntu bionic-backports/main i386 Packages 
[7.508 B]
Get:61 http://us.archive.ubuntu.com/ubuntu bionic-backports/main Translation-en 
[4.764 B]
Get:62 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 
Packages [7.484 B]
Get:63 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe i386 
Packages [7.472 B]
Get:64 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe 
Translation-en [4.436 B]
Get:65 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 
DEP-11 Metadata [7.972 B]
Get:66 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 
64x64 Icons [29 B]
Fetched 47,1 MB in 6s (404 kB/s)                                               

(appstreamcli:3515): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:3515): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:3515): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:3515): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:3515): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:3515): 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.

If none of this applies, then please report this bug using the 
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.If 
you want to investigate this yourself the log files in 
'/var/log/dist-upgrade' will contain details about the upgrade. 
Specifically, look at 'main.log' and 'apt.log'. 


Restoring original system state

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

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.29
ProcVersionSignature: Ubuntu 4.15.0-100.101~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-100-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Tue May  5 12:11:18 2020
InstallationDate: Installed on 2020-03-06 (59 days ago)
InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190227)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-05-05 (0 days ago)

** 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/1876890

Title:
  couldnt calculate to upgrade from 16.04 to 18.04

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