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prerequisite
you have to know basic of basic about partition for where your os system lies. most of modern desktop or laptop has ssd and may used gpt partition system.
command
ls to see all the partition.
set boot=(hdX,gptX) select correct partition that has to rescue form, also if you have to check partition FS type ls (hdX,gtpX)
set prefix=(hdX,gptX)/boot/grub
insmod normal
normal
after this command you type you boot to your os
make sure after load to os run sudo update-grub depends on distro.