Información sobre los paquetes no valida al actualizar Ubuntu 20.04 lts

[Guillermo Molina Holmes]

Despues de actualizar la información de paquete, el paquete esencial "ubuntu-minimal" no se puede localizar.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.45
ProcVersionSignature: Ubuntu 5.4.0-90.101~18.04.1-generic 5.4.148
Uname: Linux 5.4.0-90-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.27
Architecture: amd64
CrashDB: ubuntu
Date: Mon Nov 29 18:10:13 2021
InstallationDate: Installed on 2019-11-15 (745 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=es_CL:es
 PATH=(custom, no user)
 LANG=es_CL.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-11-29 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2021-11-29 18:02:18.919106
 Log time: 2021-11-29 18:03:12.853398
 Log time: 2021-11-29 18:09:39.064885
 Log time: 2021-11-29 18:10:26.205839
VarLogDistupgradeTermlog: