Public bug reported:
Log message after the reading the system state information:
1. Calculating the changes
2. Could not calculate the upgrade
3. An unresolvable problem occured while calculating the upgrade.
4. This was likely caused by: * Unofficial software packages not provided by
Ubuntu. Please use tool 'ppa-purge' from the ppa-purge package to remove a
launchpad PPA.
Tried to ppa-purge but issue still persists.
Had ROS installed. So uninstalled it-
>> sudo apt-get purge ROS-*
Also removed all the unrequired packages-
>> sudo apt-get autoremove
Problem still persists.
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
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Oct 2 16:39:21 2020
InstallationDate: Installed on 2019-10-03 (365 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-02 (0 days ago)
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic dist-upgrade
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https://bugs.launchpad.net/bugs/1898183
Title:
Ubuntu OS upgrade unsuccessful due to unofficial packages
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