Reference https://jingyan.baidu.com/article/3c48dd348bc005e10be358eb.html
1) Download the latest version address: http://releases.ubuntu.com/18.04/
2) Download and install the UltraISO software, insert the USB flash drive after installation
3) Then open the software, click file to open, find the downloaded Ubuntu iso file, double click to open the completed ISO file loading
4) Click on the start option (remember to click on the load image to expand it), then click the write hard image option, click it to enter the interface to be operated
5) Write Method: usb-hdd+
Quick start: Write to new hard drive master boot record (MBR)-usb-hdd+
Once setup is complete
Then click on write will pop up again to confirm whether you need to write a USB flash drive. Click Yes after the start of the write is finished, we can use the USB drive boot disk.
6) before the USB drive installation system, you also need to set the BIOS boot boot option, the default is the hard drive boot, you need to set the USB drive to boot. Boot----Constantly click on the F2 keyboard (Lenovo),
7) After entering the boot options interface, select the USB HDD SanDisk Cruzer Edge, that is, the U disk startup item, first move the cursor to this item, and then use the +/-key to move the item to the top, let it rank 1th, so that it is the first startup item
8) then select Startup (startup Item), first select "Uefi only (single uefi mode)",
9) Press the F10 key to save the exit. Plug in the USB drive, restart the computer, you can enter the U disk installation system
Enter → select Chinese → Select the first " use Ubuntu without installing (t)" To download the trial version-on the desktop with " install Ubuntu 16.04 LES" Double-click to open
11) Select "for graphics or wireless hardware ..." Click Continue
12) How to install dual system Select other option, if not, select clear entire disk
13) because it is the default, no manually set partition, skip the partitioning step directly. To partition the top page of a reference
14) Create user (computer name can be changed later), password is login password please keep in mind, continue
15) wait for .....
16) After installation, unplug the USB flash drive and restart the computer. END
Install Ubuntu system