<ul><li>To hide the power-off menu in Ubuntu with GNOME desktop, you can use the "Bring Out Submenu Of Power Off Button" extension in the Extension Manager.</li><li>To add password request for power-off and reboot actions, you can use the built-in polkit tool by creating custom polkit configuration files.</li><li>For Ubuntu 22.04 and earlier, you can create a rule in the "com.ubuntu.enable-hibernate.pkla" file in the "/etc/polkit-1/localauthority/50-local.d/" directory.</li></ul>

Hide Poweroff Menu or Request Password for Shutdown / Restart Ubuntu

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