[Bug 1927848] Re: Errros an each consecutive upgrade. The last error message was "Could not calculate the upgtade"

[Nicolas Fourcaud-Trocmé]

*** This bug is a duplicate of bug 1928101 ***
    https://bugs.launchpad.net/bugs/1928101

** This bug has been marked a duplicate of bug 1928101
   sudo do-release-upgrade fails 18.04-20.04

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https://bugs.launchpad.net/bugs/1927848

Title:
  Errros an each consecutive upgrade. The last error message was "Could
  not calculate the upgtade"

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

Bug description:
  I think the bug report already sent the main.log & apt.log .

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-142.146-generic 4.15.18
  Uname: Linux 4.15.0-142-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat May  8 23:37:04 2021
  InstallationDate: Installed on 2021-05-08 (0 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  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
  UpgradeStatus: Upgraded to bionic on 2021-05-09 (0 days ago)
  VarLogDistupgradeTermlog:

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