我对 Ubuntu 并不陌生（已经使用了 20 年了），但就像所有好朋友一样，有时它仍然会给我带来惊喜。
全新安装后（华硕 ROG 笔记本电脑上的 Ubuntu 21.10），我似乎无法使用 wifi。我没有看到 wifi 图标，在设置->wifi 中，我收到未找到 wifi 适配器的错误。
我不是 Ubuntu 专家（只是一个长期用户），而且我意识到我对 wifi 的工作原理知之甚少。
据我所知，系统无法找到 wifi 控制器（我相信没有）。
我碰巧知道 wifi 控制器确实存在并且能正常工作，因为这台电脑预装了 Windows（现在没有了），我可以毫无问题地使用 wifi。目前我通过有线连接进行连接，也可以正常工作。
任何帮助都将非常受欢迎。
我运行在论坛中找到的wifi诊断脚本，得到以下结果。
########## wireless info START ##########
Report from: 30 Mar 2022 14:35 JST +0900
Booted last: 30 Mar 2022 00:00 JST +0900
Script from: 25 Jan 2020 03:34 UTC +0000
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 21.10
Release: 21.10
Codename: impish
##### kernel ############################
Linux 5.13.0-39-generic #44-Ubuntu SMP Thu Mar 24 15:35:05 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, vt.handoff=7
##### desktop ###########################
Ubuntu
##### lspci #############################
0000:00:14.3 Network controller [0280]: Intel Corporation Device [8086:51f0] (rev 01)
DeviceName: Onboard - Ethernet
Subsystem: Intel Corporation Device [8086:0094]
0000:2c:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller [10ec:8125] (rev 05)
Subsystem: ASUSTeK Computer Inc. RTL8125 2.5GbE Controller [1043:205f]
Kernel driver in use: r8125
##### lsusb #############################
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 0b05:19b6 ASUSTek Computer, Inc. N-KEY Device
Bus 003 Device 003: ID 8087:0033 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
##### secure boot #######################
SecureBoot disabled
##### lsmod #############################
mxm_wmi 16384 1 nouveau
iwlwifi 380928 0
asus_nb_wmi 28672 0
wmi_bmof 16384 0
cfg80211 897024 1 iwlwifi
asus_wmi 40960 3 asus_nb_wmi,hid_asus,mfd_aaeon
sparse_keymap 16384 1 asus_wmi
wmi 32768 5 asus_wmi,wmi_bmof,mfd_aaeon,mxm_wmi,nouveau
video 53248 3 asus_wmi,i915,nouveau
##### interfaces ########################
##### ifconfig ##########################
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback <MAC address> brd <MAC address>
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp44s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether <MAC 'enp44s0' [IF1]> brd <MAC address>
inet 133.24.25.175/23 brd 133.24.25.255 scope global noprefixroute enp44s0
valid_lft forever preferred_lft forever
inet6 fe80::27d7:c858:c237:83df/64 scope link noprefixroute
valid_lft forever preferred_lft forever
##### iwconfig ##########################
lo no wireless extensions.
enp44s0 no wireless extensions.
##### route #############################
default via 133.24.24.254 dev enp44s0 proto static metric 100
133.24.24.0/23 dev enp44s0 proto kernel scope link src 133.24.25.175 metric 100
133.24.24.0/23 via 133.24.24.254 dev enp44s0 proto static metric 100
169.254.0.0/16 dev enp44s0 scope link metric 1000
##### resolv.conf #######################
[777 root '/etc/resolv.conf' -> '../run/systemd/resolve/stub-resolv.conf']
nameserver 127.0.0.53
options edns0 trust-ad
search .
##### network managers ##################
Installed:
NetworkManager
Running:
root 727 1 0 14:26 ? 00:00:00 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: enp44s0
GENERAL.TYPE: ethernet
GENERAL.NM-TYPE: NMDeviceEthernet
GENERAL.DBUS-PATH: /org/freedesktop/NetworkManager/Devices/2
GENERAL.VENDOR: Realtek Semiconductor Co., Ltd.
GENERAL.PRODUCT: RTL8125 2.5GbE Controller
GENERAL.DRIVER: r8125
GENERAL.DRIVER-VERSION: 9.008.00-NAPI
GENERAL.FIRMWARE-VERSION: --
GENERAL.HWADDR: <MAC 'enp44s0' [IF1]>
GENERAL.MTU: 1500
GENERAL.STATE: 100 (connected)
GENERAL.REASON: 0 (No reason given)
GENERAL.IP4-CONNECTIVITY: 4 (full)
GENERAL.IP6-CONNECTIVITY: 3 (limited)
GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.0/0000:2c:00.0/net/enp44s0
GENERAL.PATH: pci-0000:2c:00.0
GENERAL.IP-IFACE: enp44s0
GENERAL.IS-SOFTWARE: no
GENERAL.NM-MANAGED: yes
GENERAL.AUTOCONNECT: yes
GENERAL.FIRMWARE-MISSING: no
GENERAL.NM-PLUGIN-MISSING: no
GENERAL.PHYS-PORT-ID: --
GENERAL.CONNECTION: Wired connection 1
GENERAL.CON-UUID: 74ab3dfa-6d40-3a80-ac15-e5d79d5a2286
GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/1
GENERAL.METERED: no (guessed)
CAPABILITIES.CARRIER-DETECT: yes
CAPABILITIES.SPEED: 1000 Mb/s
CAPABILITIES.IS-SOFTWARE: no
CAPABILITIES.SRIOV: no
INTERFACE-FLAGS.UP: yes
INTERFACE-FLAGS.LOWER-UP: yes
INTERFACE-FLAGS.CARRIER: yes
INTERFACE-FLAGS.PROMISC: no
WIRED-PROPERTIES.CARRIER: on
IP4.ADDRESS[1]: 133.24.25.175/23
IP4.GATEWAY: 133.24.24.254
IP4.ROUTE[1]: dst = 133.24.24.0/23, nh = 0.0.0.0, mt = 100
IP4.ROUTE[2]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.ROUTE[3]: dst = 0.0.0.0/0, nh = 133.24.24.254, mt = 100
IP4.ROUTE[4]: dst = 133.24.24.0/23, nh = 133.24.24.254, mt = 100
IP4.DNS[1]: 133.24.61.2
IP4.DNS[2]: 133.24.61.1
IP6.ADDRESS[1]: fe80::27d7:c858:c237:83df/64
IP6.GATEWAY: --
IP6.ROUTE[1]: dst = fe80::/64, nh = ::, mt = 100
CONNECTIONS.AVAILABLE-CONNECTION-PATHS: /org/freedesktop/NetworkManager/Settings/1
CONNECTIONS.AVAILABLE-CONNECTIONS[1]: 74ab3dfa-6d40-3a80-ac15-e5d79d5a2286 | Wired connection 1
##### NetworkManager.state ##############
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
##### NetworkManager config #############
[[/etc/NetworkManager/conf.d/default-wifi-powersave-on.conf]]
[connection]
wifi.powersave = 2
[[/etc/NetworkManager/NetworkManager.conf]]
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
[device]
wifi.scan-rand-mac-address=no
[[/usr/lib/NetworkManager/conf.d/10-dns-resolved.conf]]
[main]
dns=systemd-resolved
[[/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf]]
[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma
[[/usr/lib/NetworkManager/conf.d/20-connectivity-ubuntu.conf]]
[connectivity]
uri=http://connectivity-check.ubuntu.com./
[[/usr/lib/NetworkManager/conf.d/no-mac-addr-change.conf]]
[device-31-mac-addr-change]
match-device=driver:eagle_sdio,driver:wl
wifi.scan-rand-mac-address=no
##### NetworkManager profiles ###########
##### Netplan config ####################
[/etc/netplan/01-network-manager-all.yaml]
network:
version: 2
renderer: NetworkManager
##### iw reg get ########################
Region: Asia/Tokyo (based on set time zone)
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
##### iwlist channels ###################
lo no frequency information.
enp44s0 no frequency information.
##### iwlist scan #######################
lo Interface doesn't support scanning.
enp44s0 Interface doesn't support scanning.
##### module infos ######################
[iwlwifi]
filename: /lib/modules/5.13.0-39-generic/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license: GPL
description: Intel(R) Wireless WiFi driver for Linux
depends: cfg80211
retpoline: Y
intree: Y
name: iwlwifi
vermagic: 5.13.0-39-generic SMP mod_unload modversions
parm: swcrypto:using crypto in software (default 0 [hardware]) (int)
parm: 11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm: amsdu_size:amsdu size 0: 12K for multi Rx queue devices, 2K for AX210 devices, 4K for other devices 1:4K 2:8K 3:12K (16K buffers) 4: 2K (default 0) (int)
parm: fw_restart:restart firmware in case of error (default true) (bool)
parm: nvm_file:NVM file name (charp)
parm: uapsd_disable:disable U-APSD functionality bitmap 1: BSS 2: P2P Client (default: 3) (uint)
parm: enable_ini:Enable debug INI TLV FW debug infrastructure (default: true (bool)
parm: bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm: led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm: power_save:enable WiFi power management (default: disable) (bool)
parm: power_level:default power save level (range from 1 - 5, default: 1) (int)
parm: disable_11ac:Disable VHT capabilities (default: false) (bool)
parm: remove_when_gone:Remove dev from PCIe bus if it is deemed inaccessible (default: false) (bool)
parm: disable_11ax:Disable HE capabilities (default: false) (bool)
[cfg80211]
filename: /lib/modules/5.13.0-39-generic/kernel/net/wireless/cfg80211.ko
description: wireless configuration support
license: GPL
depends:
retpoline: Y
intree: Y
name: cfg80211
vermagic: 5.13.0-39-generic SMP mod_unload modversions
parm: bss_entries_limit:limit to number of scan BSS entries (per wiphy, default 1000) (int)
parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[iwlwifi]
11n_disable: 0
amsdu_size: 0
bt_coex_active: Y
disable_11ac: N
disable_11ax: N
enable_ini: Y
fw_restart: Y
led_mode: 0
nvm_file: (null)
power_level: 0
power_save: N
remove_when_gone: N
swcrypto: 0
uapsd_disable: 3
[cfg80211]
bss_entries_limit: 1000
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00
##### /etc/modules ######################
##### modprobe options ##################
[/etc/modprobe.d/amd64-microcode-blacklist.conf]
blacklist microcode
[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci
[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off
[/etc/modprobe.d/intel-microcode-blacklist.conf]
blacklist microcode
[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
##### rc.local ##########################
grep: /etc/rc.local: No such file or directory
##### pm-utils ##########################
##### udev rules ########################
##### dmesg #############################
[ 2.119629] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 2.120490] Bluetooth: hci0: Found device firmware: intel/ibt-0040-0041.sfi
[ 2.648896] enp44s0: 0xffffa491011b0000, <MAC 'enp44s0' [IF1]>, IRQ 18
[ 3.540607] Bluetooth: hci0: Waiting for firmware download to complete
[ 8.408556] r8125: enp44s0: link up
[ 8.408565] IPv6: ADDRCONF(NETDEV_CHANGE): enp44s0: link becomes ready
########## wireless info END ############
答案1
您的设备 8086:51f0 未包含在该版本的驱动程序中无线上网包含在 Ubuntu 21.10 的默认 5.13 内核中。你可以使用以下命令确认这一点：
modinfo iwlwifi | grep 51f0
它返回空白。
该线程表明它包含在内核版本 5.17 及更高版本中。https://www.mail-archive.com/[电子邮件保护]/msg1846969.html
您可以使用以下命令安装 5.17：
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.17.1/amd64/linux-headers-5.17.1-051701-generic_5.17.1-051701.202203280950_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.17.1/amd64/linux-headers-5.17.1-051701_5.17.1-051701.202203280950_all.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.17.1/amd64/linux-image-unsigned-5.17.1-051701-generic_5.17.1-051701.202203280950_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.17.1/amd64/linux-modules-5.17.1-051701-generic_5.17.1-051701.202203280950_amd64.deb
sudo dpkg -i linux*.deb
该驱动程序还需要固件：
cd /usr/lib/firmware
sudo wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/iwlwifi-so-a0-gf-a0-68.ucode
sudo wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/iwlwifi-so-a0-gf-a0.pnvm
重启。
答案2
我在同一个设备 (8086:51f0) 上也遇到了这个问题，但使用的是 Ubuntu 20.04，内核 5.15.0。升级内核时遇到了麻烦，对解决方案也有点怀疑，因为此消息表明内核 5.17rc8 在加载固件时遇到了一些问题：https://www.mail-archive.com/[电子邮件保护]/msg1847049.html
相反，我按照了另一篇文章中的建议，并且立即见效：Ubuntu 22.04，配备 Killer 6E 的 Alienware x17 R2 上没有 WIFI - AX1675 Wifi 和蓝牙卡 - 蓝牙工作正常
sudo apt update
sudo apt install backport-iwlwifi-dkms
（重新启动然后检查模块是否正确加载）
sudo dmesg | grep iwl