Ubuntu boot fix: for grub rescue | grub not found | unknown filesystem type error, grubfilesystem

Ubuntu boot fix: for grub rescue | grub not found | unknown filesystem type error, grubfilesystem
Introduction

Ubuntu is usually guided by grub. Grub is divided into grub, grub2, and grub for dos (grub4dos ).
Recently, in Windows, a large score is divided into GB to install Win10. When I started Ubuntu, I encountered a problem: grub not found ==> grub rescue.
The cause of this problem is that grub cannot find the partition where Ubuntu is located (this is generally because you have adjusted the partition, but grub configuration has not been adjusted accordingly ). Generally, there are two solutions to this problem:
1. Use EasyBCD software for adjustment;
2. Use the command line to re-specify the partition;

Use the EasyBCD software to adjust and re-specify partitions under the command line.

Command explanation in grub rescue mode:
Ls: view system device status
Set: view the startup path and partition
Root: Set the grub boot partition.
Prefix: Set the startup path of grub
Insmod: loading Module

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