Failed to upgrade kubuntu 24.04

[Maxim]

I've got error during upgrading to kubuntu 24.04 release.
Tried different ways.
For example, by `sudo do-release-upgrade -m desktop` command.

And during the process I've got the following error.

"Checking package manager
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done

Calculating the changes

Calculating the changes

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."

I've tried remove kubuntu-desktop, reinstall it, but it didn't resolve the problem. :(

ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: ubuntu-release-upgrader-core 1:23.10.14
ProcVersionSignature: Ubuntu 6.5.0-35.35-generic 6.5.13
Uname: Linux 6.5.0-35-generic x86_64
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CrashReports:
 600:0:0:252011:2024-05-25 18:31:14.957998641 +0300:2024-05-25 18:31:53.909191362 +0300:/var/crash/libopenfec.0.crash
 640:1000:1000:44256:2024-05-25 17:57:32.421493665 +0300:2024-05-25 17:57:32.421493665 +0300:/var/crash/_usr_share_kubuntu-notification-helper_whoopsie-upload-all.1000.crash
CurrentDesktop: KDE
Date: Mon May 27 20:48:19 2024
InstallationDate: Installed on 2020-03-07 (1542 days ago)
InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to mantic on 2024-05-27 (0 days ago)
VarLogDistupgradeAptHistorylog:
 Start-Date: 2024-05-27 19:57:19
 Requested-By: max (1000)
 End-Date: 2024-05-27 19:57:19
VarLogDistupgradeApttermlog:
 Log started: 2024-05-27 19:57:19
 Log ended: 2024-05-27 19:57:19