Public bug reported:

"apt-key add" fails to import keys if there exists another key with a
malformed file name.

Such malformed key names used to be provided by the openSUSE Build
Service (https://github.com/openSUSE/software-o-o/issues/842).

After importing such malformed key, future key imports will fail with
something like:

    $ sudo apt-key add linux_signing_key.pub 
    gpg: invalid key resource URL 
'/tmp/apt-key-gpghome.f8IaqZ48Ze/isv:ownCloud:desktop.asc.gpg'
    gpg: keyblock resource '(null)': General error

even though no such file "isv:ownCloud:desktop.asc.gpg" exists anywhere
on the filesystem.

This affects deb packages that import public repo keys during
installation, such as Google Chrome or Vivaldi, and results in minor
issues such as breaking GUI tools and CLI warnings, and the major issue
that the installed repo cannot be used anymore to update the software
(Google Chrome, Vivaldi).

apt-key should be robust to such issues and continue importing keys. As
in the example above, apt-key should import "linux_signing_key.pub" no
matter if another unrelated key is malformed etc.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: apt 2.0.2ubuntu0.2
ProcVersionSignature: Ubuntu 5.8.0-38.43~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-38-generic x86_64
NonfreeKernelModules: openafs nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 20 19:24:34 2021
InstallationDate: Installed on 2020-04-24 (271 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: apt
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1912526

Title:
  cannot import new keys if another malformed key exists

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