Dual hard drive SSD+HDD, install win10+Ubuntu18.04 dual system (super detailed installation) (UEFI boot + GPT partition) (maybe it is the problem you are solving?)

This article is based on Ubuntu 18.04 under WIN10, the disk format is GTP, and UEFI is used to boot. Win10 is installed on the solid-state disk, the Ubuntu boot entry is on the solid-state disk, and the system is on the mechanical disk.

This article is applicable to UEFI mode (GPT) (note that some tutorials on the Internet are outdated and uncomfortable to adapt to new machines; maybe the problems you encounter can be solved in this article;)

Legacy mode (MBR, boot)
reference: https://blog.csdn.net/m0_51233386/article/details/114264254

1. Early understanding (directly affects the method of installing dual systems)

UEFI mode, suitable for new computers, hard disk GUID partition format (GPT); Legacy mode, suitable for old machines, hard disk MBR partition format;

The traditional MBR mode and the new UEFI mode, which will have a direct impact on the method of installing dual systems.
Reference: https://blog.csdn.net/m0_51233386/article/details/120924776

1. Check the BIOS mode

Distinguish between starting in UEFI mode or starting in Legacy mode?

"win+r" shortcut key to enter "Run", enter "msinfo32" and press Enter, the following interface appears, you can view the BIOS mode:

Traditional MBR mode:

The traditional MBR mode and the new UEFI mode, which will have a direct impact on the method of installing dual systems.

UEFI mode, suitable for new computers, hard disk GUID partition format (GPT),
Legacy mode, suitable for old machines, hard disk MBR partition format;

2. Check the hard disk format

Check whether the disk is in GUID format (GPT) or MBR format?

Right-click "This Computer", click "Manage", click "Disk Management":

right-click, properties to view the disk format