can't upgrade OS

[Martin Gomez Tena]

ubuntu-bug ubuntu-release-upgrader-core

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 1:18.04.41
ProcVersionSignature: Ubuntu 5.4.0-58.64~18.04.1-generic 5.4.73
Uname: Linux 5.4.0-58-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Dec 23 18:14:24 2020
InstallationDate: Installed on 2017-09-18 (1191 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-23 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

Reviewing the files from your upgrade attempt you seem to have enabled a PPA that provides Xorg packages. This will prevent the upgrade as that PPA contains package version numbers greater than the release to which you are upgrading. You can revert the PPA by installing the ppa-purge package from the official Ubuntu archive and then running 'sudo ppa-purge ppa:oibaf/graphics-drivers'. After that you can try upgrading again and if it still fails open a new bug report. Thanks and good luck!