[Bug 1893646] Re: cannot upgrade from 18.4.04 to ubuntu 20.x

[Ubuntu Foundations Team Bug Bot]

** Package changed: ubuntu => ubuntu-release-upgrader (Ubuntu)

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https://bugs.launchpad.net/bugs/1893646

Title:
  cannot upgrade from 18.4.04 to ubuntu 20.x

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

Bug description:
  Error message:

  Could not determine the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This was caused by:
   * Upgrading to a pre-release version of Ubuntu
  This is most likely a transient problem, 
  please try again later.
  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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-115.116-generic 4.15.18
  Uname: Linux 4.15.0-115-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Aug 31 13:40:29 2020
  InstallationDate: Installed on 2018-06-29 (793 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_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-31 (0 days ago)
  VarLogDistupgradeTermlog:

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