[Bug 1970449] Re: GPG keys are not shown in Software and Updates

[Benjamin Drung]

subprocess.run is nicer that subprocess.Popen since you do not have to
close the opened process. The underlying problem is that
subprocess.Popen gave you the output line by line, but stdout from
subprocess.run is the complete output. To iterate over the lines you
have to call splitlines() first. Otherwise only the first line is taken
into account and all following lines will be ignored.

I added a test case and fixed the code (besides some packaging clean-
up). Thanks H. Hösch for the analysis and for finding the culprit.

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https://bugs.launchpad.net/bugs/1970449

Title:
  GPG keys are not shown in Software and Updates

Status in software-properties package in Ubuntu:
  Confirmed
Status in software-properties source package in Jammy:
  Confirmed
Status in software-properties source package in Kinetic:
  Confirmed

Bug description:
  software-properties-gtk does not show the registered apt gpg keys in
  the "Authentication" tab on my Ubuntu 21.10 and 22.04 systems.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.10
  ProcVersionSignature: Ubuntu 5.15.0-27.28-generic 5.15.30
  Uname: Linux 5.15.0-27-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Apr 26 20:48:04 2022
  InstallationDate: Installed on 2022-04-25 (0 days ago)
  InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)

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