xserver-xorg-video all error (marked as third party software) while upgrading to 20.04

[Francesco Minnocci]

By looking at the log, there seems to be an error calculating the upgrade for xserver-xorg-video-all, but the interactive dialog showed the error message for third party software interfering with the upgrade; I don't know how to debug this further.

Ubuntu 18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
Uname: Linux 5.3.0-51-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri May 8 11:45:44 2020
InstallationDate: Installed on 2019-09-22 (228 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-05-08 (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 oibaf'. After that you try upgrading and again and if it still fails open a new bug report. Thanks and good luck!

[Francesco Minnocci (qwerty1214)]

ppa-purge didn't work, and I don't see the ppa when running `sudo apt-get update`. Should I just remove it from /etc/apt/sources.list.d manually?

[Francesco Minnocci (qwerty1214)]

Okay, for future reference this comment from the referenced duplicate https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1069133/comments/18 was the solution to my problem; thank you!