[Bug 1987353] [NEW] Software Updater not showing third-party repository with "signed-by" tag

[Mike Jing]

Public bug reported:

Since apt-key is now deprecated, I followed various guides and moved all
third-party repository keys to /etc/apt/keyrings/, then added the
"signed-by" tag to the corresponding source lists. After that, those
third-party repositories no longer show up in the "Other Software" tab
in Software Updater.

/home/jing>lsb_release -rd
Description:	Ubuntu 22.04.1 LTS
Release:	22.04

/home/jing>apt-cache policy update-manager
update-manager:
  Installed: 1:22.04.9
  Candidate: 1:22.04.9
  Version table:
 *** 1:22.04.9 500
        500 http://archive.ubuntu.mirror.rafal.ca/ubuntu jammy/main amd64 Packages
        500 http://archive.ubuntu.mirror.rafal.ca/ubuntu jammy/main i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: update-manager 1:22.04.9
ProcVersionSignature: Ubuntu 5.15.0-46.49-generic 5.15.39
Uname: Linux 5.15.0-46-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Mon Aug 22 18:27:09 2022
InstallationDate: Installed on 2018-10-23 (1399 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to jammy on 2022-08-21 (1 days ago)

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug jammy

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https://bugs.launchpad.net/bugs/1987353

Title:
  Software Updater not showing third-party repository with "signed-by"
  tag

Status in update-manager package in Ubuntu:
  New

Bug description:
  Since apt-key is now deprecated, I followed various guides and moved
  all third-party repository keys to /etc/apt/keyrings/, then added the
  "signed-by" tag to the corresponding source lists. After that, those
  third-party repositories no longer show up in the "Other Software" tab
  in Software Updater.

  /home/jing>lsb_release -rd
  Description:	Ubuntu 22.04.1 LTS
  Release:	22.04

  /home/jing>apt-cache policy update-manager
  update-manager:
    Installed: 1:22.04.9
    Candidate: 1:22.04.9
    Version table:
   *** 1:22.04.9 500
          500 http://archive.ubuntu.mirror.rafal.ca/ubuntu jammy/main amd64 Packages
          500 http://archive.ubuntu.mirror.rafal.ca/ubuntu jammy/main i386 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: update-manager 1:22.04.9
  ProcVersionSignature: Ubuntu 5.15.0-46.49-generic 5.15.39
  Uname: Linux 5.15.0-46-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: XFCE
  Date: Mon Aug 22 18:27:09 2022
  InstallationDate: Installed on 2018-10-23 (1399 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to jammy on 2022-08-21 (1 days ago)

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