[Bug 1897993] [NEW] Upgrade from v18 LTS to 20.04.1 LTS doesn't work both via shell and using upgrade manager

[Paul]

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

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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

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  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)

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