Public bug reported: I tried to upgrade from 18.04 to 20.04 per Ubuntu instructions. Upgrade halted at early stage "Could not calculate the upgrade" with likely cause said to be unofficial software packages. I tried to remove with GUI Software & Updates but that did not help. I do not know how to use ppa-purge tool.
Description: Ubuntu 18.04.5 LTS Release: 18.04 ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: ubuntu-release-upgrader-core 1:18.04.41 ProcVersionSignature: Ubuntu 4.15.0-50201905291620.0+mediatree+hauppauge-generic 4.15.18 Uname: Linux 4.15.0-50201905291620-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.21 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: ubuntu:GNOME Date: Wed Dec 30 22:20:35 2020 InstallationDate: Installed on 2018-07-17 (897 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to bionic on 2020-12-30 (0 days ago) ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic dist-upgrade -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1909689 Title: Upgrade from 18.04 to 20.04 failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1909689/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs