Lock screen bug Ubuntu 20 (Ctrl+Alt+F7)

[Jordi]

Hello, I have discovered a bug in my Ubuntu 20 that I would like to fix, I have searched everywhere but I have not found any solution. The problem is that when I lock the session with the button in the upper right corner if I press "Ctrl+Alt+F7" it returns to my desktop without asking for any password. Does anyone know any solution?

For now I don’t want to upgrade to Ubuntu 22 and I use the default window manager.

Thank you.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-screensaver 3.6.1-11ubuntu4
ProcVersionSignature: Ubuntu 5.15.0-79.86~20.04.2-generic 5.15.111
Uname: Linux 5.15.0-79-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 22 14:35:39 2023
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GsettingsGnomeSession:
 org.gnome.desktop.session session-name 'ubuntu'
 org.gnome.desktop.session idle-delay uint32 300
InstallationDate: Installed on 2020-10-28 (1028 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen locking issue
UpgradeStatus: No upgrade log present (probably fresh install)