Public bug reported:

Upgrade from ubuntu 14 using update-manager failed. Console log follows
:

Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done
Building data structures... 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
Building data structures... Done 
gerard@ASUS-HP-UB:~$ sudo ubuntu-bug ubuntu-release-upgrader-core

(apport-gtk:15348): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.

(firefox:15645): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.11
ProcVersionSignature: Ubuntu 3.19.0-80.88~14.04.1-generic 3.19.8-ckt22
Uname: Linux 3.19.0-80-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.29
Architecture: amd64
CrashDB: ubuntu
Date: Mon May 20 16:39:21 2019
InstallationDate: Installed on 2015-09-25 (1332 days ago)
InstallationMedia: Kubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2019-05-20 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/1829767

Title:
  upgrade to ubuntu 16 from 14 failed

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