Install ubuntu 20.04 LTS with EF

1. Format USB flash driver in Fat32 style and clone the "ubuntu***iso" into it with UltralSO.
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   2.Restart computer by USB flash driver. In BIOS, USB_HDD should be in the top position.
   
   3.Part disk (IMPORTANT)

swap: (主分区)16G(跟你自己内存一样大)；空间起始位置；
EFI System: (逻辑分区), 500M;
EXT4->/: (主分区)30G, 空间起始位置, EXT4；/
EXT4->/home: (逻辑分区), 文件存放位置，剩下的所有空间给它；空间起始位置；

The installation crush: # An attempt to configure apt to install additional packages from the CD failed
Open terminal and type :

sudo rm /usr/lib/ubiquity/apt-setup/generators/40cdrom

Install ubuntu again.