我是 Ubuntu 的新手，才 3 天。我答应我的朋友解决他的笔记本电脑问题。这台笔记本电脑很旧，是戴尔 Latitude E6400，它有一个版本 14，WiFi 突然不能用了，我升级到了 Ubuntu 18 LTS。
问题是我无法再次使用 WiFi，WiFi 设置中显示“未找到 WiFi 适配器”。但可以使用以太网电缆上网。
我在论坛上做了广泛的研究，但没有任何解决方案可行，我认为每台笔记本电脑都是特定且不同的，因此我想在这里写下来，如果您能帮助我解决这些命令的结果，我将非常高兴。
ubuntu@ubuntu-Latitude-E6400:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
ubuntu@ubuntu-Latitude-E6400:~$ uname -r
5.4.0-66-generic
ubuntu@ubuntu-Latitude-E6400:~$ lspci
00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network Connection (rev 03)
0c:00.0 Network controller: Intel Corporation Ultimate N WiFi Link 5300
ubuntu@ubuntu-Latitude-E6400:~$ rfkill list
0: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: yes
1: dell-wifi: Wireless LAN
Soft blocked: yes
Hard blocked: yes
2: dell-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: yes
3: dell-wwan: Wireless WAN
Soft blocked: no
Hard blocked: yes
root@ubuntu-Latitude-E6400:~# lshw -c network
*-network
description: Ethernet interface
product: 82567LM Gigabit Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: enp0s25
version: 03
serial: 00:21:70:ea:0a:ba
size: 1Gbit/s
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k duplex=full firmware=1.7-7 ip=192.168.1.247 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:29 memory:f6fe0000-f6ffffff memory:f6fdb000-f6fdbfff ioport:efe0(size=32)
*-network DISABLED
description: Wireless interface
product: Ultimate N WiFi Link 5300
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:0c:00.0
logical name: wlp12s0
version: 00
serial: 00:21:6a:34:fd:fa
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.4.0-66-generic firmware=8.83.5.1 build 33692 latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:31 memory:f1ffe000-f1ffffff
*-network DISABLED
description: Ethernet interface
physical id: 2
logical name: wwp0s29f7u6i7
serial: 02:80:37:ec:02:00
capabilities: ethernet physical
configuration: broadcast=yes driver=cdc_ether driverversion=22-Aug-2005 firmware=Mobile Broadband Network Device link=no multicast=yes
root@ubuntu-Latitude-E6400:~# iwconfig
lo no wireless extensions.
wlp12s0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=off
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
enp0s25 no wireless extensions.
wwp0s29f7u6i7 no wireless extensions.
root@ubuntu-Latitude-E6400:~# lsusb
Bus 002 Device 002: ID 413c:8147 Dell Computer Corp. F3507g Mobile Broadband Module
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0c45:63f1 Microdia Integrated Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 0a5c:5801 Broadcom Corp. BCM5880 Secure Applications Processor with fingerprint swipe sensor
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
ubuntu@ubuntu-Latitude-E6400:~$ ifconfig
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.247 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::9f28:1ad2:7625:bbab prefixlen 64 scopeid 0x20<link>
ether 00:21:70:ea:0a:ba txqueuelen 1000 (Ethernet)
RX packets 20767 bytes 8348403 (8.3 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 12493 bytes 1697647 (1.6 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 22 memory 0xf6fe0000-f7000000
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 2639 bytes 276167 (276.1 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2639 bytes 276167 (276.1 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ubuntu@ubuntu-Latitude-E6400:~$ lsmod
Module Size Used by
hid_logitech_hidpp 45056 0
hid_logitech_dj 28672 0
hid_generic 16384 0
usbhid 53248 1 hid_logitech_dj
hid 126976 4 usbhid,hid_generic,hid_logitech_dj,hid_logitech_hidpp
dell_rbtn 20480 0
nvidia_uvm 36864 0
gpio_ich 16384 0
snd_hda_codec_idt 61440 1
dell_laptop 20480 0
snd_hda_codec_generic 81920 1 snd_hda_codec_idt
ledtrig_audio 16384 2 snd_hda_codec_generic,dell_laptop
snd_hda_intel 49152 3
snd_intel_dspcfg 24576 1 snd_hda_intel
dell_smm_hwmon 20480 0
snd_hda_codec 135168 3 snd_hda_codec_generic,snd_hda_intel,snd_hda_codec_idt
snd_hda_core 90112 4 snd_hda_codec_generic,snd_hda_intel,snd_hda_codec,snd_hda_codec_idt
iwldvm 233472 0
uvcvideo 94208 0
videobuf2_vmalloc 20480 1 uvcvideo
videobuf2_memops 20480 1 videobuf2_vmalloc
coretemp 20480 0
videobuf2_v4l2 24576 1 uvcvideo
cdc_ether 20480 0
snd_hwdep 20480 1 snd_hda_codec
videobuf2_common 53248 2 videobuf2_v4l2,uvcvideo
videodev 217088 3 videobuf2_v4l2,uvcvideo,videobuf2_common
usbnet 45056 1 cdc_ether
mac80211 851968 1 iwldvm
kvm 655360 0
mc 53248 4 videodev,videobuf2_v4l2,uvcvideo,videobuf2_common
snd_pcm 102400 3 snd_hda_intel,snd_hda_codec,snd_hda_core
joydev 28672 0
mii 16384 1 usbnet
cdc_wdm 24576 0
cdc_acm 40960 0
snd_seq_midi 20480 0
input_leds 16384 0
libarc4 16384 1 mac80211
dell_wmi 20480 0
wl 6451200 0
sparse_keymap 16384 1 dell_wmi
serio_raw 20480 0
nvidia 10584064 109 nvidia_uvm
snd_seq_midi_event 16384 1 snd_seq_midi
dell_smbios 28672 2 dell_wmi,dell_laptop
snd_rawmidi 36864 1 snd_seq_midi
iwlwifi 339968 1 iwldvm
snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event
dcdbas 20480 1 dell_smbios
dell_wmi_descriptor 20480 2 dell_wmi,dell_smbios
wmi_bmof 16384 0
lpc_ich 24576 0
cfg80211 712704 4 wl,iwldvm,iwlwifi,mac80211
drm 491520 4 nvidia
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 36864 2 snd_seq,snd_pcm
snd 86016 16 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_pcm,snd_hda_codec_idt,snd_rawmidi
soundcore 16384 1 snd
mac_hid 16384 0
sch_fq_codel 20480 2
parport_pc 40960 0
ppdev 24576 0
lp 20480 0
parport 53248 3 parport_pc,lp,ppdev
ip_tables 32768 0
x_tables 40960 1 ip_tables
autofs4 45056 2
psmouse 151552 0
firewire_ohci 40960 0
ahci 40960 1
firewire_core 65536 1 firewire_ohci
libahci 32768 1 ahci
sdhci_pci 53248 0
cqhci 28672 1 sdhci_pci
sdhci 65536 1 sdhci_pci
crc_itu_t 16384 1 firewire_core
wmi 32768 4 dell_wmi,wmi_bmof,dell_smbios,dell_wmi_descriptor
video 49152 2 dell_wmi,dell_laptop
e1000e 253952 0
ubuntu@ubuntu-Latitude-E6400:~$ sudo dmesg | grep iwl
[ 16.785257] iwlwifi 0000:0c:00.0: can't disable ASPM; OS doesn't have ASPM control
[ 17.077080] iwlwifi 0000:0c:00.0: loaded firmware version 8.83.5.1 build 33692 op_mode iwldvm
[ 18.306376] iwlwifi 0000:0c:00.0: CONFIG_IWLWIFI_DEBUG disabled
[ 18.306379] iwlwifi 0000:0c:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
[ 18.306380] iwlwifi 0000:0c:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[ 18.306382] iwlwifi 0000:0c:00.0: Detected Intel(R) Ultimate N WiFi Link 5300 AGN, REV=0x24
[ 18.312899] iwlwifi 0000:0c:00.0: reporting RF_KILL (radio disabled)
[ 18.312917] iwlwifi 0000:0c:00.0: RF_KILL bit toggled to disable radio.
[ 18.353033] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[ 20.072235] iwlwifi 0000:0c:00.0 wlp12s0: renamed from wlan0