Mapping Ctrl+Alt+Delete to Shut Down in Ubuntu 20

  1. Start Settings
  2. Select Keyboard Shortcuts
  3. In the System section, disable the shortcut for Log out
  4. At the bottom, select + to add a custom shortcut
  5. Name it Shut down
  6. Set the command to gnome-session-quit --power-off
  7. Enter Ctrl+Alt+Delete for the shortcut