Public bug reported:

on Ubuntu 20.04.2 LTS
Hello,
I don't know if it's worth it, but you'll know. 

from working on the graphic mode, if I go to the text terminal mode
using [Ctrl]+[alt]+[F3] login do some work or not, then want to go back
to graphic mode with [Ctrl]+[alt]+[F1].

Normally, I should be login to the graphic mode to go back, but if you
use [Ctrl]+[alt]+[F2] instead, it bypasses de login screen. Tried it
with both of my PC's, same thing.

I tried it on X11 and Wayland, same thing.

If we wait long enough to pass the preset time out of the graphic mode
when on text terminal , and try to come back to graphic, it disables the
bypass.

But, if you were listening a web radio on Firefox in between, the bypass
is still accessible way after the time out.

Have a nice day.

E. Dacougnia

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.9-0ubuntu0.20.04.2
ProcVersionSignature: Ubuntu 5.8.0-59.66~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-59-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sat Jul 17 16:31:28 2021
DisplayManager: gdm3
InstallationDate: Installed on 2021-01-09 (188 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.36.9-0ubuntu0.20.04.1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal wayland-session

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https://bugs.launchpad.net/bugs/1936718

Title:
  login screen can be bypass

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