I have had this discussion with Gnome Shell developers when I first saw
the bug, some versions behind, they see it as a feature, not as a bug.
It is like fighting the wind over there. In the real world, where people
expect computers and OS's to do what they say they do, a lock screen is
supposed to lock access. Whatever else is running behind, access should
be restricted, otherwise, it is worthless as a secure OS and lock
screen. I know this should be on Gnome Shell developers, but as Ubuntu
joined the boat using it, it becomes a problem for Ubuntu, too. I am
tired of posting bugs on Gnome bugzilla because it is difficult, close
to impossible to fight them (a lost fight was there to add back file
sorting by extension in search, for instance).

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https://bugs.launchpad.net/bugs/1875038

Title:
  Lock screen not really functioning - Gnome Shell extensions visible
  and active even in lock screen

Status in gnome-shell package in Ubuntu:
  Invalid

Bug description:
  Lock screen should block access to computer until the screen is unlocked. 
But, although it was fixed either in extensions, or the lock screen itself in 
Ubuntu 19.10, it is now present again. I can remove shortcuts from Dash to Dock 
bar, I can run whatever app is there. In my view, this is a security flaw that 
in some cases can lead to jokes (removing) or even crashing the computer if 
really multiple windows of some app are started. And who knows what kind of 
apps are there.
  I did report it in the past, I also reported the bug in Gnome Bugzilla and 
the extension bug reporting app - they were bouncing from one to the other. At 
some point the bug disappeared. I think Ubuntu should fix this until something 
bad happens. See the attachment.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-shell 3.36.1-5ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
  Uname: Linux 5.4.0-26-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr 25 17:52:58 2020
  DisplayManager: gdm3
  InstallationDate: Installed on 2020-04-24 (1 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  RelatedPackageVersions: mutter-common 3.36.1-3ubuntu3
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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