[Bug 1890638] Re: I am unable to update my Ubuntu from 18.04 to 20.4

[Brian Murray]

Please add the files /var/log/dist-upgrade/apt.log and /var/log/dist-
upgrade/main.log from your most recent upgrade attempt then.

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https://bugs.launchpad.net/bugs/1890638

Title:
  I am unable to update my Ubuntu from 18.04 to 20.4

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Since the Ubuntu 20.04 is out I decide to upgrade my OS. I have Ubuntu 18.04.4 and tried to update using my terminal. But it won't update giving the message:-
  Could not calculate the upgrade 

  An unresolvable problem occurred while calculating the upgrade.

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again. 

  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 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
  Uname: Linux 4.15.0-112-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Aug  6 22:23:08 2020
  InstallationDate: Installed on 2018-08-13 (723 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_IN
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-06 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-06T22:08:50.361763

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