Here is a brief summary of the process
1 First download the Ubuntu image and prepare a U disk as the boot disk
2 Open the ISO file with ultra ISO, menu bar, start, write to disk
3 After the system disk is written, the next step is to enter bios and select the startup item
4 Start and enter the installation interface, mainly to select other installation options (other...) during installation.
5 Enter the partition interface, find idle, and double-click