linux Super+L not working to lock screen (even though it is configured)

tux_tina

I've used multiple Linux Ubuntu 20 and 22 systems, and most of them work "out of the box" with Super+L (aka Windows+L) configured to lock the screen . On one machine, however, it doesn't work even though it is configured. See screenshot: Another co-worker also experienced this problem. My question is Why doesn't Super+L when it is properly configured lock the screen? What is the command that is run? Searching for solution I've tried searching...

Originally asked by PatS on Stack Exchange (superuser) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

Why doesn't Super+L when it is properly configured lock the screen? Ubuntu uses GNOME as its default desktop environment. Its screen-locker is integrated into GNOME Shell, rather than being an external program, and most of it is the exact same code as is used for displaying the login screen of GNOME's standard GDM "display manager" (the software which starts X11 on startup and shows the graphical logon screen). But it's a mutual dependency – the GNOME screen-locker also relies on GDM being present to handle the actual password checking. This avoids the need for gnome-shell to directly interact with PAM components (like gnome-screensaver would have needed in the past), as well as allowing it...

Full answer by grawity: https://superuser.stackexchange.com/a/1896346 (CC BY-SA 4.0).

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