Can't upgrade to 20.04 from 18.04

[Javier Valencia]

2020-09-09 15:32:13,664 DEBUG running doUpdate() (showErrors=True)
2020-09-09 15:32:22,982 DEBUG openCache()
2020-09-09 15:32:23,492 DEBUG Comparing 4.15.0-115 with
2020-09-09 15:32:23,492 DEBUG Comparing 4.15.0-117 with 4.15.0-115
2020-09-09 15:32:23,603 DEBUG /openCache(), new cache size 66285
2020-09-09 15:32:23,603 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2020-09-09 15:32:23,604 DEBUG quirks: running PreDistUpgradeCache
2020-09-09 15:32:23,604 DEBUG running Quirks.PreDistUpgradeCache
2020-09-09 15:32:23,604 INFO installing python-is-python2 because python-minimal was installed
2020-09-09 15:32:23,604 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
2020-09-09 15:32:23,743 ERROR Dist-upgrade failed: 'E:No se pudieron corregir los problemas, usted ha retenido paquetes rotos.'
2020-09-09 15:32:23,746 DEBUG abort called
2020-09-09 15:32:23,747 DEBUG openCache()
2020-09-09 15:32:25,558 DEBUG Comparing 4.15.0-115 with
2020-09-09 15:32:25,558 DEBUG Comparing 4.15.0-117 with 4.15.0-115
2020-09-09 15:32:25,731 DEBUG /openCache(), new cache size 99516

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18
Uname: Linux 4.15.0-117-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
Date: Wed Sep 9 15:32:52 2020
InstallationDate: Installed on 2019-01-04 (614 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-09 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-09-09T13:54:36.500052

[Brian Murray (brian-murray)]

Reviewing the files from your upgrade attempt you have installed nodejs from a location other than the offical Ubuntu archive. This version of nodejs is greater than the one in the official archive and is keeping some python packages installed which then prevents the upgrade from being calculated. Please remove nodejs along with any other packages from that archive and disable the archive. After that you can try upgrading again and if it still fails open a new bug report. Thanks and good luck!