Workaround for Linux boot into grub problem

Use the LS (hd0,x)/grub command to view the contents of each disk,

Situation one: If you found it in the/boot/grub directory

Grub rescue>root= (hd0,9)

Grub Rescue>prefix=/boot/grub//grub Path settings

Grub Rescue>set root= (hd0,9)

Grub Rescue>set prefix= (hd0,9)/boot/grub

Grub Rescue>insmod Normal//start normal startup

Grub Rescue>normal

Case two: If you found it under the/grub directory

Grub rescue>root= (hd0,9)

Grub Rescue>prefix=/grub//grub Path settings

Grub Rescue>set root= (hd0,9)

Grub Rescue>set prefix= (hd0,9)/grub

Grub Rescue>insmod Normal//start normal startup

Grub Rescue>normal

Then you can see the startup item and then enter the system.

sudo update-grub

sudo grub-install/dev/sda

Workaround for Linux boot into grub problem