ubuntu-minimal no se puede localizar al actualizar de Ubuntu 18.04 a 20.04

[Adrian]

Después de actualizar la información de paquete, el paquete esencial "ubuntu-minimal" no se puede localizar. Vea /etc/apt/sources.list para conocer la configuración de lista actual de orígenes de software.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
Date: Mon Oct 5 09:37:00 2020
InstallationDate: Installed on 2018-12-03 (672 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=es_AR.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-05 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2020-10-05 09:32:16.072952
 Log time: 2020-10-05 09:32:51.633991
 Log time: 2020-10-05 09:35:58.884774
 Log time: 2020-10-05 09:37:08.108949
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

Reviewing the log file, /var/log/dist-upgrade/main.log, from your upgrade attempt there was a failure to communicate with the mirror of the Ubuntu archive which you use. This could either be due to an issue with your connection to the mirror or with the mirror itself. Regardless, this is an issue you'll need to sort out by fixing your network connection or switching to a different mirror of the Ubuntu archive before the upgrade can complete. If after resolving the communication error with the mirror you are still unable to upgrade to a new release of Ubuntu please open a new bug report so we'll have fresh log files. Thanks and good luck!

[Launchpad Janitor (janitor)]

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