Ohh!! 
problem solve after reinstalling a few times … .
( i think it’s may be caused by changing the grub boot option to allowing windows to boot at first…??? is it true??? )
but a problem could not solve : after wake up from sleep display distorted graphics … 
https://forum.garudalinux.org/t/distorted-graphics-after-wake-from-sleep-mode/16934
this is not working… because here the solution is to disable the compositor