update-manager: upgrading to lubuntu 18.10 fails

[Irenux]

The program says it cannot upgrade lubuntu 18.04 to 18.10 because there is something wrong with the package sources, although I disabled all non-offical repo's and it's downloading from the official server for my country (Netherlands).

lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04

Package: update-manager 1.18.04.11.8 (bionic updates)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.29
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: LXDE
Date: Sat Jan 5 19:41:58 2019
InstallationDate: Installed on 2018-04-30 (250 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2019-01-05 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update-manager.release-upgrades: 2019-01-05T16:36:03.575056

[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 oibaf'. After that you try upgrading and again and if it still fails open a new bug report. Thanks and good luck!