Ubuntu 20.04 cannot upgrade to 22.04

[Ferda Arikan]

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.

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 20.04
Package: ubuntu-release-upgrader-core 1:20.04.39
ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128
Uname: Linux 5.4.0-81-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 8 21:47:56 2023
InstallationDate: Installed on 2015-10-25 (2632 days ago)
InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2023-01-08 (0 days ago)
VarLogDistupgradeTermlog:

[Nick Rosbrook (enr0n)]

Reviewing the files from your upgrade attempt, you have installed packages from the remmina-ppa-team/remmina-next PPA. Some of the packages installed are newer than those in the official archive, which is preventing the upgrade from being calculated. Please try running ppa-purge ppa:remmina-ppa-team/remmina-next to remove packages installed from that PPA. After that you can try upgrading again and if it still fails open a new bug report. Thanks and good luck!

[Ferda Arikan (ferdaarikan)]

Thanks for pointing to the ppa, much appreciated, this solved my issue. I tried to find the offending ppa without much luck before.