How to install a wireless NIC Driver in Ubuntu

How to install a wireless NIC Driver in Ubuntu
Acer (acer) cannot use wifi after Ubuntu is installed. The solution is as follows:

Ps: Acer wireless network cards are generally Broadcom

Step 4: 1. Create a New cdrom folder in the media folder under the root directory and enter sudo mkdir/media/cdrom on the terminal. 2. Load the installation package, that is, the Ubuntu system image (iso file). Enter the sudo mount-t iso9660-o loop/* system image path */media/cdrom on the terminal.

3. Open settings-> Software and updates, select "install from optical drive" at the bottom, and enter the command sudo apt-get install bcmwl-kernel-source on the terminal. (My computer is acer4752G, and my wireless NIC Driver is bcmwl ).

4. Restart your computer