1. First of all, you have to ensure that the newly installed system can be connected to the Internet, right, but when there is no network cable, I can only do this. You can use a networked mobile phone and USB cable to connect to the computer, turn on the USB sharing network, and you can go online.
2. Change the software source. Change the "download from" in the figure below to an appropriate address, you can choose Ali, Tencent, etc.
3. Enter the "Additional Drivers" tab, if the network is normal and the source settings are normal, then the corresponding wireless network card driver can generally be found, and then restart the computer after installation. Pay attention to whether your bois is located in UEFI and secure boot is turned on. You must turn off secure boot, because the dedicated driver is closed source, while ubuntu is open source. Microsoft believes that "closed source systems are not safe, so closed source software is in It cannot be enabled when secure boot is turned on".
If the WiFi list still cannot be displayed at this time, you can try to enter the following command in the terminal:
sudo apt-get update
sudo apt-get install bcmwl-kernel-source
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The above are my rough steps to solve the problem, but this problem may also be caused by other reasons. Since it is the first time to install Ubuntu system, it is relatively noisy. Record this problem for your future reference~
Any problems you encountered in this process, please leave a message and let me see what problems you all encountered.