do-release-upgrade to lunar fails with incorrect ppa detection

[GeekSmith]

~/ lsb_release -rd
Description: Ubuntu 22.10
Release: 22.10

~/ apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
  Installed: 1:22.10.8
  Candidate: 1:22.10.8
  Version table:
 *** 1:22.10.8 500
        500 http://us.archive.ubuntu.com/ubuntu kinetic/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu kinetic/main i386 Packages
        100 /var/lib/dpkg/status

Using 'sudo do-release-upgrade' to upgrade kinetic to lunar, the upgrader fails to upgrade my system. It suggests that using ppa-purge to disable all ppa repositories might help, but my system does not use any ppa repositories. I do use some third-party repos, but those should have been disabled by the upgrader. I'm submitting this bug as suggested by the message emitted by the upgrader.

ProblemType: Bug
DistroRelease: Ubuntu 22.10
Package: ubuntu-release-upgrader-core 1:22.10.8
ProcVersionSignature: Ubuntu 5.19.0-45.46-generic 5.19.17
Uname: Linux 5.19.0-45-generic x86_64
ApportVersion: 2.23.1-0ubuntu3.2
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun 15 18:10:44 2023
InstallationDate: Installed on 2022-06-01 (379 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to kinetic on 2023-06-16 (0 days ago)

[GeekSmith (lixo-geeksmith)]

I found this line in VarLogDistupgradeMainlog.txt:

2023-06-15 18:06:23,981 DEBUG Foreign: brave-browser brave-keyring protonvpn protonvpn-cli protonvpn-gui protonvpn-stable-release python3-proton-client python3-protonvpn-nm-lib teamviewer

I removed those packages and performed the upgrade without issues. The package list should be displayed to the user during the upgrade, and it could offer to remove these packages and try to install them after the upgrade is complete.

I've been an Ubuntu user since the first release, never had this happen during an upgrade before now.