unable to upgrade to 20.04

[Radu]

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If
you want to investigate this yourself the log files in
'/var/log/dist-upgrade' will contain details about the upgrade.
Specifically, look at 'main.log' and 'apt.log'.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.44
ProcVersionSignature: Ubuntu 5.4.0-80.90~18.04.1-generic 5.4.124
Uname: Linux 5.4.0-80-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.24
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 4 13:20:50 2021
InstallationDate: Installed on 2019-05-26 (800 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-08-04 (0 days ago)

[Chris Guiver (guiverc)]

Thank you for taking the time to report this issue and helping to make Ubuntu better.

You have a number of 3rd party packages that are stopping the upgrade, eg. mesa-vdpau-drivers:amd64 (21.2.0~rc3+git2108022230.58bf0165ca0~b~mesarc5) which has a package ver. that prevents upgrade to focal.

Please remove your 3rd party (Unofficial software packages) using a tool like 'ppa-purge' from your PPA's and try again.

I've marked this incomplete, as third party packages from PPAs have prevented the upgrade; the upgrade tools are intended to work with Ubuntu repository software only. If you believe I'm in error, please leave a comment explaining why and you can return the status to "New".

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]