[Bug 1915656] Re: can't apply upgrade from 18.4 to 20.4, because there are unindentified sources (but I don't know which are)

[Launchpad Bug Tracker]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no
activity for 60 days.]

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1915656

Title:
  can't apply upgrade from 18.4 to 20.4, because there are unindentified
  sources (but I don't know which are)

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

Bug description:
  No se ha podido calcular la actualización

  Se produjo un problema irresoluble al calcular la actualización.

   Esto podría deberse a:
   * Paquetes de software no oficiales, no proporcionados por Ubuntu
  Utilice la herramienta «ppa-purge» desde el paquete 
  ppa-purge para quitar software de una PPA de Launchpad PPA e 
  intente actualizar de nuevo.

  Si nada de esto es aplicable, entonces informe de este error usando el
  comando «ubuntu-bug ubuntu-release-upgrader-core» en una terminal. Si
  quiere investigar el problema por su cuenta, los registros en
  «/var/log/dist-upgrade» contienen detalles de la actualización; en
  particular, consulte «main.log» y «apt.log».

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
  Uname: Linux 4.15.0-135-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Feb 14 19:37:03 2021
  InstallationDate: Installed on 2014-09-12 (2346 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=es_ES.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-02-14 (0 days ago)
  VarLogDistupgradeTermlog:

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