For some ATX machine, it may cannot automatically shutting down on Linux. How to fix this ?
(1) Find a file name rc.modules
(2) You can find this file by typing a command :
(3) Edit that file with this command :
(4) Find a row containing "/sbin/modprobe apm"
(5) If there is a comment "#", uncomment that or delete the "#" sign on that row
(6) Rebooting your machine to test an effect.