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

[Julian Andres Klode]

Thank you for your bug report. Unfortunately, this is an issue in a
third-party package, and not in Ubuntu. I suggest you raise it with
them.

Presumably they are a Chrome-like package and this is a side-effect of
https://bugs.chromium.org/p/chromium/issues/detail?id=1106309&q=&can=4 -
if they install a proper file into trusted.gpg.d, it will be removed
alongside the sources.list.d file on purge only.

** Changed in: apt (Ubuntu)
       Status: New => Invalid

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

Status in apt package in Ubuntu:
  Invalid

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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