连接方法：ubuntu20.04连接wifi的方法(2种)

sudo apt update

sudo apt-get install bcmwl-kernel-source

#列出你的网络
ip a

ubuntu@ubuntu:~$ cat /etc/netplan/50-cloud-init.yaml
 
network:
  ethernets:
    eth0:
      dhcp4: true
      optional: true
  version: 2
  wifis:
      wlan0:
          dhcp4: true
          access-points:
              "你的wifi的ssid":
                  password: "你的密码"

netplan try
netplan apply