error al actualizar Ubuntu 18.04.5 LTS al Ubuntu 20.04.1 LTS

[Gustavo]

2020-08-08 23:57:10,317 DEBUG entry '# deb [arch=amd64] https://repo.skype.com/deb stable main # (desactivado al actualizar a focal)' was disabled (unknown mirror)
2020-08-08 23:57:10,317 DEBUG examining: 'deb http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic main'
2020-08-08 23:57:10,318 DEBUG entry '# deb http://ppa.launchpad.net/linuxuprising/java/ubuntu focal main # (desactivado al actualizar a focal)' was disabled (unknown mirror)
2020-08-08 23:57:12,399 DEBUG running doUpdate() (showErrors=True)
2020-08-08 23:57:57,068 ERROR IOError/SystemError in cache.update(): 'E:Fallo al obtener http://it-mirrors.evowise.com/ubuntu/dists/focal-security/main/dep11/Components-amd64.yml.xz El archivo tiene un tamaño inesperado (21172 != 21192). ¿La sincronización de la réplica está en progreso? [IP: 172.67.6.37 80]
Hashes of expected file:
 - Filesize:21192 [weak]
 - SHA256:10baada6fc548a14927c3ef2cebc05edddb4401965a2ecb5e26273fb977f5406
 - SHA1:8991ae8efb1af2b43300ee5443eb14a7d936f828 [weak]
 - MD5Sum:5a5e7979fd22cb12b807264628175dcc [weak]
Release file created at: Fri, 07 Aug 2020 08:57:51 +0000
, E:Fallo al obtener http://it-mirrors.evowise.com/ubuntu/dists/focal-security/universe/dep11/Components-amd64.yml.xz , E:No se han podido descargar algunos archivos de índice, se han omitido, o se han utilizado unos antiguos en su lugar.'. Retrying (currentRetry: 0)
2020-08-08 23:58:00,617 ERROR IOError/SystemError in cache.update(): 'E:Fallo al obtener http://it-mirrors.evowise.com/ubuntu/dists/focal-security/main/dep11/Components-amd64.yml.xz El archivo tiene un tamaño inesperado (21172 != 21192). ¿La sincronización de la réplica está en progreso? [IP: 172.67.6.37 80]
Hashes of expected file:
 - Filesize:21192 [weak]
 - SHA256:10baada6fc548a14927c3ef2cebc05edddb4401965a2ecb5e26273fb977f5406
 - SHA1:8991ae8efb1af2b43300ee5443eb14a7d936f828 [weak]
 - MD5Sum:5a5e7979fd22cb12b807264628175dcc [weak]
Release file created at: Fri, 07 Aug 2020 08:57:51 +0000
, E:Fallo al obtener http://it-mirrors.evowise.com/ubuntu/dists/focal-security/universe/dep11/Components-amd64.yml.xz , E:No se han podido descargar algunos archivos de índice, se han omitido, o se han utilizado unos antiguos en su lugar.'. Retrying (currentRetry: 1)
2020-08-08 23:58:01,698 ERROR IOError/SystemError in cache.update(): 'E:Fallo al obtener http://it-mirrors.evowise.com/ubuntu/dists/focal-security/main/dep11/Components-amd64.yml.xz El archivo tiene un tamaño inesperado (21172 != 21192). ¿La sincronización de la réplica está en progreso? [IP: 172.67.6.37 80]
Hashes of expected file:
 - Filesize:21192 [weak]
 - SHA256:10baada6fc548a14927c3ef2cebc05edddb4401965a2ecb5e26273fb977f5406
 - SHA1:8991ae8efb1af2b43300ee5443eb14a7d936f828 [weak]
 - MD5Sum:5a5e7979fd22cb12b807264628175dcc [weak]
Release file created at: Fri, 07 Aug 2020 08:57:51 +0000
, E:Fallo al obtener http://it-mirrors.evowise.com/ubuntu/dists/focal-security/universe/dep11/Components-amd64.yml.xz , E:No se han podido descargar algunos archivos de índice, se han omitido, o se han utilizado unos antiguos en su lugar.'. Retrying (currentRetry: 2)
2020-08-08 23:58:01,698 ERROR doUpdate() failed completely
2020-08-08 23:59:35,019 DEBUG abort called
2020-08-08 23:59:35,027 DEBUG openCache()
2020-08-08 23:59:37,250 DEBUG /openCache(), new cache size 98935

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
Uname: Linux 4.15.0-112-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CrashDB: ubuntu
Date: Sun Aug 9 00:42:54 2020
InstallationDate: Installed on 2017-09-27 (1046 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-08-09 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.