To add a "Power Off..." option to the lock screen on Debian 13 with GNOME, you need to modify the GNOME Shell's lock screen behavior. By default, GNOME's lock screen does not show the power off option, but you can enable it using dconf or gsettings.

Steps to Add "Power Off" to the Lock Screen

1. Open a Terminal

Press Ctrl + Alt + T to open a terminal.

2. Check Current Settings

Run the following command to check the current settings for the lock screen:

gsettings get org.gnome.settings-daemon.plugins.power power-button-action

This will return the current action (e.g., 'suspend', 'hibernate', or 'nothing').

3. Enable the Power Off Option

To ensure the "Power Off..." option appears on the lock screen, set the power-button-action to 'interactive':

gsettings set org.gnome.settings-daemon.plugins.power power-button-action 'interactive'

4. Verify the Change

Lock your screen (Super + L or manually lock it) and check if the "Power Off..." option appears in the bottom-right corner of the lock screen.

Alternative: Use dconf Editor (GUI)

If you prefer a graphical method:

1. Install dconf Editor if not already installed:
   bash

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   sudo apt install dconf-editor

2. Open dconf Editor and navigate to:
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   org > gnome > settings-daemon > plugins > power

3. Find the power-button-action key and set its value to 'interactive'.

Why This Works

• The power-button-action setting controls what happens when you click the power button on the login/lock screen.
• Setting it to 'interactive' ensures that the lock screen shows a menu with options like "Power Off...", "Restart", and "Suspend".

Note

• This change does not require creating another user or modifying system files.
• If the option still doesn't appear, ensure you are using GNOME Shell (not a custom login manager like LightDM or SDDM).