Got it,
Tank you for all your answers and sorry if I lost some of your time here.
Have a nice day!
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https://bugs.launchpad.net/bugs/1936718
Title:
screen doesn't automatically lock whe
Thanks for the bug report but this is not a bug.
The login screen always exists separately on VT1 (Ctrl+Alt+F1) to your
desktop on VT2 (Ctrl+Alt+F2). And the desktop is not meant to lock
immediately. It should do after some period of time, but won't "if you
were listening a web radio on Firefox" b