in the ubuntu-settings package, the file of 10_ubuntu-settings.gschema.override override "critical-battery-action = 'suspend'",but unity-control-center don't provide the option of "suspend",so it show us blank
in the ubuntu-settings package, the file of 10_ubuntu- settings. gschema. override override "critical- battery- action = 'suspend'",but unity-control- center don't provide the option of "suspend",so it show us blank