[Bug 1993813] Re: do-release-upgrade aborts without giving a reason

[Florian Beier]

The issue is resolved. I started disabling 3rd party apt repos and tried
a do-release-upgrade run for each disabled repo. Then I disabled the
Ubuntu ESM repos. That lead to the upgrader asking me if a new
sources.list should be generated. I confirmed and then saw the following
error while package lists from the Ubuntu Kinetic repos were being
fetched:

The following signatures couldn't be verified because the public key is
not available: NO_PUBKEY 871920D1991BC93C

I added the missing key using 'sudo apt-key adv --keyserver
keyserver.ubuntu.com --recv-keys 871920D1991BC93C'. Afterwards the
release upgrader ran successfully and I'm now on Ubuntu Kinetic Kudu.

All my entries in /etc/apt/sources.list from Ubuntu Jammy Jellyfish
begin with 'deb [signed-by=/usr/share/keyrings/ubuntu-archive-
keyring.gpg]' while the new ones for Kinetic Kudu just begin with 'deb'.
I think I removed the Ubuntu Archive Automatic Signing Key from
/etc/apt/trusted.gpg at some point because of the deprecation warning
during 'sudo apt update':

http://archive.ubuntu.com/ubuntu/dists/kinetic/InRelease: Key is stored
in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the
DEPRECATION section in apt-key(8) for details.

I then added '[signed-by=/usr/share/keyrings/ubuntu-archive-
keyring.gpg]' to each Ubuntu repo entry in /etc/apt/sources.list.

Conclusion: It seems like the Ubuntu Archive Signing Key missing from
/etc/apt/trusted.gpg broke the ubuntu-release-upgrader.

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https://bugs.launchpad.net/bugs/1993813

Title:
  do-release-upgrade aborts without giving a reason

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

Bug description:
  I try to upgrade from Ubuntu 22.04 to Ubuntu 22.10 but do-release-
  upgrade aborts the upgrade process without giving a reason.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.14
  ProcVersionSignature: Ubuntu 5.15.0-52.58-generic 5.15.60
  Uname: Linux 5.15.0-52-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.2
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Oct 21 14:06:05 2022
  InstallationDate: Installed on 2020-08-06 (805 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to jammy on 2022-10-21 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2022-10-21T10:03:24.126872

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