Public bug reported: Was experiencing 2 issues. The first one is resolved but may be related to the one currently being faced, hence why I'm sharing it:
Issue 1) Software-Updater prompts to upgrade to 20.04.1 LTS but clicking on upgrade causes the dialog box to disappear and does nothing in the background. After fiddling around and updating and upgrading all packages, I found that wine wasn't getting updated for some reason, so I readded the PPAs for that and updated it via shell. This resolved the issue and upon a restart, the Software-Updater upgrade to 20.04.1 LTS started going to the actual upgrade screen upon clicking upgrade. Issue 2) Software-Updater fails at the 2nd step during upgrade and generates the error in the attached screenshot. I disabled all third party ppas, restarted, and ran again. This did not fix the overall issue but the prompt mentioning 3rd party ppas as a possible cause no longer shows up in the dialog box and only suggests filing a bug. I also tried using sudo do-release-upgrade and it generates the exact same error as using the GUI interface. All packages are up to date and nothing is identified as possible packages left to update, third party or otherwise. I also don't see unnecessary packages sitting on the system. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: ubuntu-release-upgrader-core 1:18.04.38 ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18 Uname: Linux 4.15.0-118-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.17 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: ubuntu:GNOME Date: Wed Sep 30 22:15:34 2020 InstallationDate: Installed on 2017-10-25 (1071 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader UpgradeStatus: Upgraded to bionic on 2020-10-01 (0 days ago) ** Affects: ubuntu-release-upgrader (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic dist-upgrade ** Attachment added: "screenshot of error" https://bugs.launchpad.net/bugs/1897993/+attachment/5415898/+files/Screenshot%20from%202020-09-30%2021-56-19.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1897993 Title: Upgrade from v18 LTS to 20.04.1 LTS doesn't work both via shell and using upgrade manager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1897993/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs