unable to upgrade to ubuntu 20.04

[Cuong Nguyen]

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

This was likely caused by:
* Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge' from the ppa-purge
package to remove software from a Launchpad PPA and
try the upgrade again.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.39
ProcVersionSignature: Ubuntu 5.14.0-1054.61-oem 5.14.21
Uname: Linux 5.14.0-1054-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 29 14:38:20 2022
DistributionChannelDescriptor:
 # This is the distribution channel descriptor for the OEM CDs
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-focal-amd64-20200502-85
InstallationDate: Installed on 2022-04-22 (190 days ago)
InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 20200502-05:58
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2022-10-29 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2022-10-27T20:50:16.969590

[Nick Rosbrook (enr0n)]

Reviewing the files from your upgrade attempt, you have installed pipewire packages from the pipewire-debian/pipewire-upstream PPA. Some of the packages installed are newer than those in the official archive, which is keeping some pipewire-related packages installed which then prevents the upgrade from being calculated. Please try using the ppa-purge tool to remove packages installed from ppa:pipewire-debian/pipewire-upstream by running ppa-purge -s ppa.launchpad.net -o pipewire-debian -p pipewire-upstream. After that you can try upgrading again and if it still fails open a new bug report. Thanks and good luck!