我买了一个 Wifi 适配器，但没有 Linux 的驱动程序。我在 Windows 上安装了驱动程序，并读取了代码 8811CU。我按照太多指南操作，但都没用，这是最详细的：
- https://github.com/brektrou/rtl8821CU
- https://forum.mxlinux.org/viewtopic.php?f=107&t=55788
- https://forum.ubuntu-it.org/viewtopic.php?t=632419
按照此操作后，WiFi 适配器不工作，没有 wlan 接口，并且 led 熄灭。
这里有一些输出：
#sudo usb_modeswitch -KW -v 0bda -p 1a2b
root@user-PC-Desktop:/usr/src/rtl8821CU# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 0bda:1a2b Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 003: ID 04b3:3025 IBM Corp. NetVista Full Width Keyboard
Bus 003 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
after:
root@user-PC-Desktop:/usr/src/rtl8821CU# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 006: ID 0bda:c811 Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 003: ID 04b3:3025 IBM Corp. NetVista Full Width Keyboard
Bus 003 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
root@user-PC-Desktop:~# sudo lshw
description: USB controller
product: MCP78S [GeForce 8200] EHCI USB 2.0 Controller
vendor: NVIDIA Corporation
physical id: 2.1
bus info: pci@0000:00:02.1
version: a1
width: 32 bits
clock: 66MHz
capabilities: debug pm ehci bus_master cap_list
configuration: driver=ehci-pci latency=0 maxlatency=1 mingnt=3
resources: irq:22 memory:fde7ec00-fde7ecff
*-usbhost
product: EHCI Host Controller
vendor: Linux 5.3.0-45-generic ehci_hcd
physical id: 1
bus info: usb@1
logical name: usb1
version: 5.03
capabilities: usb-2.00
configuration: driver=hub slots=6 speed=480Mbit/s
*-usb UNCLAIMED
description: Generic USB device
product: 802.11ac NIC
vendor: Realtek
physical id: 6
bus info: usb@1:6
version: 2.00
serial: 123456
capabilities: usb-2.00
configuration: maxpower=500mA speed=480Mbit/s
root@user-PC-Desktop:~# sudo lshw -c network
*-network
description: Ethernet interface
product: MCP77 Ethernet
vendor: NVIDIA Corporation
physical id: a
bus info: pci@0000:00:0a.0
logical name: enp0s10
version: a2
serial: 00:21:97:ec:24:25
size: 100Mbit/s
capacity: 100Mbit/s
width: 32 bits
clock: 66MHz
capabilities: pm msi ht bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=forcedeth driverversion=0.64 duplex=full ip=192.168.1.115 latency=0 link=yes maxlatency=20 mingnt=1 multicast=yes port=MII speed=100Mbit/s
resources: irq:30 memory:fde7c000-fde7cfff ioport:c880(size=8) memory:fde7e400-fde7e4ff memory:fde7e000-fde7e00f
root@user-PC-Desktop:~# lspci -nnk | grep -iA2 net
00:0a.0 Ethernet controller [0200]: NVIDIA Corporation MCP77 Ethernet [10de:0760] (rev a2)
Subsystem: Elitegroup Computer Systems MCP77 Ethernet [1019:1b67]
Kernel driver in use: forcedeth
Kernel modules: forcedeth
root@user-PC-Desktop:~# lsmod
Module Size Used by
nls_iso8859_1 16384 1
snd_hda_codec_via 20480 1
snd_hda_codec_generic 81920 1 snd_hda_codec_via
ledtrig_audio 16384 1 snd_hda_codec_generic
snd_hda_codec_hdmi 57344 1
snd_hda_intel 53248 4
snd_seq_midi 20480 0
snd_seq_midi_event 16384 1 snd_seq_midi
edac_mce_amd 32768 0
snd_intel_nhlt 20480 1 snd_hda_intel
snd_hda_codec 131072 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_via
snd_hda_core 90112 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_via
serio_raw 20480 0
input_leds 16384 0
snd_rawmidi 36864 1 snd_seq_midi
snd_hwdep 20480 1 snd_hda_codec
snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event
k8temp 16384 0
snd_pcm 102400 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
wmi_bmof 16384 0
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 36864 2 snd_seq,snd_pcm
snd 86016 19 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_hda_codec_via,snd_pcm,snd_rawmidi
soundcore 16384 1 snd
mac_hid 16384 0
sch_fq_codel 20480 2
parport_pc 40960 1
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
uas 24576 0
usb_storage 73728 2 uas
hid_generic 16384 0
usbhid 53248 0
hid 126976 2 usbhid,hid_generic
radeon 1454080 11
i2c_algo_bit 16384 1 radeon
ttm 102400 1 radeon
drm_kms_helper 180224 1 radeon
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
psmouse 151552 0
fb_sys_fops 16384 1 drm_kms_helper
drm 491520 6 drm_kms_helper,radeon,ttm
ahci 40960 0
pata_acpi 16384 0
forcedeth 73728 0
libahci 32768 1 ahci
pata_amd 20480 1
i2c_nforce2 20480 0
video 49152 0
floppy 81920 0
wmi 32768 1 wmi_bmof
root@user-PC-Desktop:~# ls /lib/modules/$(uname -r)/kernel/drivers/net/wireless/realtek/rtl8821cu
8821cu.ko
root@user-PC-Desktop:~# sudo dkms status
bcmwl, 6.30.223.271+bdcom, 5.3.0-45-generic, x86_64: installed
rtl8821CU, 5.4.1, 5.3.0-45-generic, x86_64: installed (WARNING! Diff between built and installed module!)
root@user-PC-Desktop:~# sudo rfkill list all
root@user-PC-Desktop:~# iwconfig
lo no wireless extensions.
enp0s10 no wireless extensions.
有人能帮我解决这个问题吗？？？