[Bug 1935050] [NEW] After uninstall apt autoremove removes keyring, but repo remains and throws error on 'sudo apt update'

[Alf HP Lund]

Public bug reported:

I manually added a repository to install a program (brave-browser).
After testing for a while I decided the browswer does not suit my needs
and did "sudo apt purge brave-browser", then "sudo apt autoremove".

Expected result: my system works as before, just without brave-browser.

What happened: "sudo apt autoremove" deleted the keyring of brave-
browser, but left the file /etc/apt/sources.list.d/brave-browser-
release.list

Subsequently "sudo apt update" throws these messages:

"W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://brave-browser-apt-release.s3.brave.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C
W: Failed to fetch https://brave-browser-apt-release.s3.brave.com/dists/stable/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C
W: Some index files failed to download. They have been ignored, or old ones used instead."

Uninstalling a program should keep the keyring if it is needed to verify
repositories. There could be an option to remove both (though I think
removing the repo while keeping the keyring would not return errors).

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: apt 2.0.6
ProcVersionSignature: Ubuntu 5.4.0-77.86-lowlatency 5.4.119
Uname: Linux 5.4.0-77-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Thu Jul  8 15:04:54 2021
InstallationDate: Installed on 2021-02-07 (150 days ago)
InstallationMedia: Kubuntu 20.04.2 LTS "Focal Fossa" - Release amd64 (20210204)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Summary changed:

- After uninstall apt autoremove removes keyring, but repo remains and throws error
+ After uninstall apt autoremove removes keyring, but repo remains and throws error on 'sudo apt update'

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https://bugs.launchpad.net/bugs/1935050

Title:
  After uninstall apt autoremove removes keyring, but repo remains and
  throws error on 'sudo apt update'

Status in apt package in Ubuntu:
  New

Bug description:
  I manually added a repository to install a program (brave-browser).
  After testing for a while I decided the browswer does not suit my
  needs and did "sudo apt purge brave-browser", then "sudo apt
  autoremove".

  Expected result: my system works as before, just without brave-
  browser.

  What happened: "sudo apt autoremove" deleted the keyring of brave-
  browser, but left the file /etc/apt/sources.list.d/brave-browser-
  release.list

  Subsequently "sudo apt update" throws these messages:

  "W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://brave-browser-apt-release.s3.brave.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C
  W: Failed to fetch https://brave-browser-apt-release.s3.brave.com/dists/stable/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C
  W: Some index files failed to download. They have been ignored, or old ones used instead."

  Uninstalling a program should keep the keyring if it is needed to
  verify repositories. There could be an option to remove both (though I
  think removing the repo while keeping the keyring would not return
  errors).

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: apt 2.0.6
  ProcVersionSignature: Ubuntu 5.4.0-77.86-lowlatency 5.4.119
  Uname: Linux 5.4.0-77-lowlatency x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Thu Jul  8 15:04:54 2021
  InstallationDate: Installed on 2021-02-07 (150 days ago)
  InstallationMedia: Kubuntu 20.04.2 LTS "Focal Fossa" - Release amd64 (20210204)
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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