upgrade 20.04 crashes

[Geos]

 ubuntu-bug ubuntu-release-upgrader-core
Gtk-Message: 18:06:16.970: GtkDialog mapped without a transient parent. This is discouraged.
comm: /var/log/dmesg: No such file or directory
geos-theos@Geos-Theos:~$ [5425:5425:0928/180754.410057:ERROR:sharing_service.cc(260)] Device registration failed with fatal error
[5425:5425:0928/180754.657987:ERROR:CONSOLE(1)] "[Shields]: Can't request shields panel data. Error: No tab url specified", source: chrome-extension://mnojpmjdmbbfmejpflffifhffcmidifd/out/brave_extension_background.bundle.js (1)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 28 18:06:13 2020
InstallationDate: Installed on 2019-09-11 (383 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-09-28 (0 days ago)
VarLogDistupgradeTermlog:

mtime.conffile..etc.update-manager.release-upgrades: 2020-09-28T16:34:19.128668

[Brian Murray (brian-murray)]

The upgrade to Ubuntu 20.04 is failing to calculate because you have installed graphics driver packages from the kisak-ubuntu-kisak-mesa PPA. Please remove that PPA using the tool ppa-purge. It will also install the official Ubuntu versions of the same packages and after that try the upgrade again.

[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:kisak/kisak-mesa'. After that you can try upgrading again and if it still fails open a new bug report. Thanks and good luck!