Public bug reported: per previous suggestions (in a bug report) i tried "sudo ppa-purge ppa:oibaf/graphics-drivers". i don't have that ppa - but still have the same issue.
Thanks for all your invaluable help Andrew ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: ubuntu-release-upgrader-core 1:18.04.37 ProcVersionSignature: Ubuntu 5.3.0-45.37~18.04.1-generic 5.3.18 Uname: Linux 5.3.0-45-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.15 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: ubuntu:GNOME Date: Thu Jul 16 14:15:54 2020 InstallationDate: Installed on 2019-11-28 (230 days ago) InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to bionic on 2020-07-16 (0 days ago) ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic dist-upgrade ** Attachment added: "apt.log" https://bugs.launchpad.net/bugs/1887739/+attachment/5393049/+files/apt.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1887739 Title: 20.04 failed to calculate upgrade issue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1887739/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs