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在 Ubuntu 20.04.3 LTS 上未找到 wifi 网络

tag-icon • tag-icon networking 20.04 wireless
在 Ubuntu 20.04.3 LTS 上未找到 wifi 网络

前言：我的电脑出现“未找到 wifi 适配器”问题。我问在 Ubuntu 20.04.3 LTS 上未找到 wifi 适配器，并且 chili555 给出的答案很好。

今天重启后，我遇到了一个新问题。现在，wifi 已启用，但找不到任何 wifi 网络。（尽管 USB-Tethering 可以工作）。内核版本是 5.13.0-27-generic

  1. 输出iwconfig：
lo        no wireless extensions.
usb0      no wireless extensions.
wlp1s0    IEEE 802.11  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=3 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
docker0   no wireless extensions.
  1. sudo lshw -C network：
  *-network                 
       description: Wireless interface
       product: MEDIATEK Corp.
       vendor: MEDIATEK Corp.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: wlp1s0
       version: 00
       serial: c8:94:02:c1:7a:7b
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=mt7921e driverversion=5.13.0-27-generic firmware=____010000-20211014150922 latency=0 link=no multicast=yes wireless=IEEE 802.11
       resources: irq:88 memory:e0300000-e03fffff memory:e0400000-e0403fff memory:e0404000-e0404fff
  *-network
       description: Ethernet interface
       physical id: 1
       bus info: usb@1:2
       logical name: usb0
       serial: 82:75:76:11:9e:70
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=rndis_host driverversion=5.13.0-27-generic duplex=half firmware=RNDIS device ip=192.168.42.130 link=yes multicast=yes port=twisted pair
  1. rfkill list all：
0: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no
1: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  1. sudo iwlist scan：
lo        Interface doesn't support scanning.
usb0      Interface doesn't support scanning.
wlp1s0    No scan results
docker0   Interface doesn't support scanning.
  1. lspci -nnk | grep 0280 -A3：
01:00.0 Network controller [0280]: MEDIATEK Corp. Device [14c3:0608]
    Subsystem: MEDIATEK Corp. Device [14c3:0608]
    Kernel driver in use: mt7921e
    Kernel modules: mt7921e
  1. sudo dmesg | grep mt7：
[    3.629484] mt7921e 0000:01:00.0: enabling device (0000 -> 0002)
[    3.629700] mt7921e 0000:01:00.0: disabling ASPM  L1
[    3.629746] mt7921e 0000:01:00.0: ASIC revision: 79610010
[    3.712374] mt7921e 0000:01:00.0: HW/SW Version: 0x8a108a10, Build Time: 20211014150838a
[    3.724385] mt7921e 0000:01:00.0: WM Firmware Version: ____010000, Build Time: 20211014150922
[    3.754924] mt7921e 0000:01:00.0: Firmware init done
[    5.326846] mt7921e 0000:01:00.0 wlp1s0: renamed from wlan0

我也尝试过sudo apt-get install --reinstall network-manager、、、 sudo systemctl restart network-manager.service重启sudo /etc/init.d/network-manager force-reload多次。但是没有运气！！

答案1

您正在使用相对较新的现代 Wi-Fi 适配器。据我所知，此适配器不适用于低于 的内核版本5.14。但是，内核5.15.7+ 无法安装在 Ubuntu 20.04 LTS 上。如果我们查看内核 5.14，它是停产。很遗憾，您无法在 20.04 中使用 Wi-Fi 适配器！您必须全新安装 21.10（或使用 升级sudo do-release-upgrade）并按照我的这个答案中的步骤并安装内核5.16。

我正在使用与您相同的 Wi-Fi 适配器。

答案2

在终端做

sudo ifconfig wlp1s0 up
sudo iwconfig wlp1s0 power off
sudo iwconfig wlp1s0 txpower 18

这就是我们在聊天中为了让它运行起来所做的事情，https://chat.stackexchange.com/rooms/133648/discussion-between-arnob-saha-and-jeremy31

答案3

运行模块版本健全性检查，它将显示内核中是否存在原始模块。

sudo apt install --reinstall bcmwl-kernel-source

检查原始模块后，如果未找到，它将添加通用模块。

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