无法连接到 Wi-Fi Ubuntu 20.04 服务器

我无法在新安装的设备上连接到我的 Wi-Fi 网络Ubuntu 20.04 server（没有安装其他软件包wireless-tools）。

首先，我检查（用lspci）系统检测到我的 Wi-Fi 适配器（Network controller Qualcomm Atheros AR9462 Wireless Network Adapter [168c:0034] (rev 01)）。然后，我检查了接口名称

foo@bar: iwconfig
docker0   no wireless extensions.
lo        no wireless extensions.
enp1s0    no wireless extensions.
wlp2s0    IEEE 802.11  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=16 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off

然后，我将接口名称添加wl2ps0到netplan配置文件中 /etc/netplan/01-netcfg.yaml

network:
  version: 2
  ethernets:
    enp1s0:
      dhcp4: true
  wifis:
    wlp2s0:
      dhcp4: true
      access-points:
        "MyNetworkSSID":
        password: "MySecretPasswort"

并重新启动系统。重启后系统没有连接到Wi-Fi和接口wlp2s0

foo@bar: ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 00:e4:4f:68:02:9b brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000
    link/ether b0:10:41:84:69:e1 brd ff:ff:ff:ff:ff:ff
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default 
    link/ether 02:42:61:94:e2:20 brd ff:ff:ff:ff:ff:ff

是DOWN。我试图用它来激活它， ip link set wlp2s0 up但这没有效果（界面仍然是DOWN）。

这里有什么问题？