im dual boot windows 10 n ubuntu mate. i have a problem when first boot go to windows 10 and go to ubuntu its getting freeze. i can’t type anyword but cursor moving normally. when i press ctrl + alt + f1-f7 its showing nothing. so i long press power button to shutdown ubuntu , i worry it will broke my hdd. But when first boot go to ubuntu its normal (not freezing). i have reinstall lightdm but its not working