About grub after win10 start page
Update:
in the face of grub, ls command may not detect the condition of windows profile will appear, that can not be detected windows disk, in this case, it can be found more than a few times to restart the windows disk
The reason: the computer abnormal shutdown: crash / black / forced shutdown
eg: 
boot appears grub boot page because previously installed Linux so grub can be changed after I forced shutdown
given the complexity of the development machine configuration environment select the check information to solve
grub1 with grub2 differentiated
no root / rootnoverify commands in grub2 in so start to resolve to find according to the information in the information process to resolve discovery grub can not find ... in fact you are grub2
Grub2 begin to repair the Windows bootmgfw.efi find files, find by LS
LS directly to all disk, disk in order to find the filesystem until not so far unknown, continue ls (hd *, *) / until you find is windows / linux systems disk
general file repair windows in /efi/Microsoft/Boot/bootmgfw.efi
After finding
1.ESC to grub2
2.insmod part_gpt import module can be seen gpt disk format
3. ls file location found bootmgfw.efi
position 4. chainloader /efi...(bootmgfw.efi file)
5. The Boot
After the completion of the steps:
Reference links: (https://blog.csdn.net/hikkilover/article/details/82290873)
