我知道这个论坛上关于这个问题的所有类似问题。我关注了每一篇关于如何修复“未找到 Wi-Fi 适配器”错误的一般建议的帖子https://unix.stackexchange.com/questions/416180/ubuntu-no-wifi-adapter-found到Ubuntu 18.04 未找到 WiFi 适配器 [Dell Inspiron 3542。]。
几周前我收到了我的 Dell Precision 5540。Wi-fi 适配器工作正常。突然，Wi-fi 适配器不可用了。这是在我更新 BIOS（建议更新）并将笔记本电脑的所有权从零售商处转让后不久发生的。
Ubuntu 18.04 已为我安装。以下是我的输出：
请参阅lspci-knn| grep Net-A3
mikel@mikel-Precision-5540:~$ lspci -knn | grep Net -A3
3b:00.0 Network controller [0280]: Intel Corporation Device [8086:2723] (rev 1a)
Subsystem: Intel Corporation Device [8086:4080]
3c:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader [10ec:525a] (rev 01)
Subsystem: Dell RTS525A PCI Express Card Reader [1028:0906]
请参阅lspci-knn| grep Net-A2
mikel@mikel-Precision-5540:~$ lspci -knn | grep Net -A2
3b:00.0 Network controller [0280]: Intel Corporation Device [8086:2723] (rev 1a)
Subsystem: Intel Corporation Device [8086:4080]
3c:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader [10ec:525a] (rev 01)
sudo rfkill 列表
mikel@mikel-Precision-5540:~$ sudo rfkill list
0: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
1: dell-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
sudo lshw -C 网络
mikel@mikel-Precision-5540:~$ sudo lshw -C network
*-network UNCLAIMED
description: Network controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:3b:00.0
version: 1a
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix cap_list
configuration: latency=0
resources: memory:ed400000-ed403fff
*-network
description: Ethernet interface
physical id: 2
logical name: enx3448edc97b27
serial: 34:48:ed:c9:7b:27
size: 1Gbit/s
capacity: 1Gbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.09.9 duplex=full ip=192.168.0.155 link=yes multicast=yes port=MII speed=1Gbit/s
消息 | grep ath9k
no output
sudo iw dev
no output
mokutil--sb状态； modinfo iwlwifi
mikel@mikel-Precision-5540:~$ mokutil --sb-state; modinfo iwlwifi
SecureBoot disabled
filename: /lib/modules/4.15.0-1079-oem/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license: GPL
author: Copyright(c) 2003- 2015 Intel Corporation <[email protected]>
description: Intel(R) Wireless WiFi driver for Linux
firmware: iwlwifi-100-5.ucode
firmware: iwlwifi-1000-5.ucode
firmware: iwlwifi-135-6.ucode
firmware: iwlwifi-105-6.ucode
firmware: iwlwifi-2030-6.ucode
firmware: iwlwifi-2000-6.ucode
firmware: iwlwifi-5150-2.ucode
firmware: iwlwifi-5000-5.ucode
firmware: iwlwifi-6000g2b-6.ucode
firmware: iwlwifi-6000g2a-6.ucode
firmware: iwlwifi-6050-5.ucode
firmware: iwlwifi-6000-6.ucode
firmware: iwlwifi-7265D-29.ucode
firmware: iwlwifi-7265-17.ucode
firmware: iwlwifi-3168-29.ucode
firmware: iwlwifi-3160-17.ucode
firmware: iwlwifi-7260-17.ucode
firmware: iwlwifi-8265-36.ucode
firmware: iwlwifi-8000C-36.ucode
firmware: iwlwifi-9260-th-b0-jf-b0-38.ucode
firmware: iwlwifi-9260-th-a0-jf-a0-38.ucode
firmware: iwlwifi-9000-pu-a0-jf-b0-38.ucode
firmware: iwlwifi-9000-pu-b0-jf-b0-38.ucode
firmware: iwlwifi-9000-pu-a0-jf-a0-38.ucode
firmware: iwlwifi-QuQnj-a0-hr-a0--38.ucode
firmware: iwlwifi-QuQnj-a0-jf-b0--38.ucode
firmware: iwlwifi-QuQnj-f0-hr-a0--38.ucode
firmware: iwlwifi-Qu-a0-jf-b0--38.ucode
firmware: iwlwifi-Qu-a0-hr-a0--38.ucode
srcversion: 4E5682727AA9D4F14E07C43
alias: pci:v00008086d000040C0sv*sd00000A10bc*sc*i*
alias: pci:v00008086d000040C0sv*sd00000000bc*sc*i*
alias: pci:v00008086d00002720sv*sd00000310bc*sc*i*
alias: pci:v00008086d00002720sv*sd00000090bc*sc*i*
alias: pci:v00008086d00002720sv*sd00001080bc*sc*i*
alias: pci:v00008086d00002720sv*sd00000030bc*sc*i*
alias: pci:v00008086d00002720sv*sd00000070bc*sc*i*
alias: pci:v00008086d00002720sv*sd00000078bc*sc*i*
alias: pci:v00008086d000034F0sv*sd00000070bc*sc*i*
alias: pci:v00008086d00002720sv*sd00000000bc*sc*i*
alias: pci:v00008086d000034F0sv*sd00000310bc*sc*i*
alias: pci:v00008086d00002720sv*sd00000A10bc*sc*i*
alias: pci:v00008086d0000A370sv*sd000042A4bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00004234bc*sc*i*
alias: pci:v00008086d0000A370sv*sd000040A4bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00004034bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00004030bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00002034bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00002030bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00001552bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00001551bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00001210bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00001030bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00001010bc*sc*i*
alias: pci:v00008086d0000A370sv*sd000002A4bc*sc*i*
alias: pci:v00008086d0000A370sv*sd000002A0bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00000264bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00000260bc*sc*i*
alias: pci:v00008086d0000A370sv*sd0000023Cbc*sc*i*
alias: pci:v00008086d0000A370sv*sd00000238bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00000234bc*sc*i*
alias: pci:v00008086d0000A370sv*sd00000230bc*sc*i*
alias: pci:v00008086d0000A370sv*sd000000A4bc*sc*i*
alias: pci:v00008086d00004232sv*sd00001301bc*sc*i*
alias: pci:v00008086d00004232sv*sd00001201bc*sc*i*
depends: cfg80211
retpoline: Y
intree: Y
name: iwlwifi
vermagic: 4.15.0-1079-oem SMP mod_unload
signat: PKCS#7
signer:
sig_key:
sig_hashalgo: md4
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, 4K for other devices 1:4K 2:8K 3:12K (default 0) (int)
parm: fw_restart:restart firmware in case of error (default true) (bool)
parm: antenna_coupling:specify antenna coupling in dB (default: 0 dB) (int)
parm: nvm_file:NVM file name (charp)
parm: d0i3_disable:disable d0i3 functionality (default: Y) (bool)
parm: lar_disable:disable LAR functionality (default: N) (bool)
parm: uapsd_disable:disable U-APSD functionality bitmap 1: BSS 2: P2P Client (default: 3) (uint)
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: fw_monitor:firmware monitor - to debug FW (default: false - needs lots of memory) (bool)
parm: d0i3_timeout:Timeout to D0i3 entry when idle (ms) (uint)
parm: disable_11ac:Disable VHT capabilities (default: false) (bool)
我是不是应该恢复出厂设置？几天前我的 Wi-fi 适配器还运行正常，但我不知道为什么现在它却无法工作了。
更新：
sudo apt install backport-iwlwifi-dkms
mikel@mikel-Precision-5540:~$ sudo apt install backport-iwlwifi-dkms
[sudo] password for mikel:
Reading package lists... Done
Building dependency tree
Reading state information... Done
backport-iwlwifi-dkms is already the newest version (8042-0ubuntu1pop1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.