I've buyed a Wifi Adapter but there isn't the driver for Linux. I have installaed the driver on Windows and read the code 8811CU. I followed too much guide but it never work, this is the most detailed:
After have followed this the WiFi adapter don't work, there isn't the wlan interface and the led is OFF.
Here some output:
#sudo usb_modeswitch -KW -v 0bda -p 1a2broot@user-PC-Desktop:/usr/src/rtl8821CU# lsusbBus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 001 Device 005: ID 0bda:1a2b Realtek Semiconductor Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 003 Device 003: ID 04b3:3025 IBM Corp. NetVista Full Width KeyboardBus 003 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical MouseBus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubafter:root@user-PC-Desktop:/usr/src/rtl8821CU# lsusbBus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubBus 001 Device 006: ID 0bda:c811 Realtek Semiconductor Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hubBus 003 Device 003: ID 04b3:3025 IBM Corp. NetVista Full Width KeyboardBus 003 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical MouseBus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hubroot@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/sroot@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-fde7e00froot@user-PC-Desktop:~# lspci -nnk | grep -iA2 net00:0a.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: forcedethroot@user-PC-Desktop:~# lsmodModule Size Used bynls_iso8859_1 16384 1snd_hda_codec_via 20480 1snd_hda_codec_generic 81920 1 snd_hda_codec_vialedtrig_audio 16384 1 snd_hda_codec_genericsnd_hda_codec_hdmi 57344 1snd_hda_intel 53248 4snd_seq_midi 20480 0snd_seq_midi_event 16384 1 snd_seq_midiedac_mce_amd 32768 0snd_intel_nhlt 20480 1 snd_hda_intelsnd_hda_codec 131072 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_viasnd_hda_core 90112 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_viaserio_raw 20480 0input_leds 16384 0snd_rawmidi 36864 1 snd_seq_midisnd_hwdep 20480 1 snd_hda_codecsnd_seq 69632 2 snd_seq_midi,snd_seq_midi_eventk8temp 16384 0snd_pcm 102400 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_corewmi_bmof 16384 0snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidisnd_timer 36864 2 snd_seq,snd_pcmsnd 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_rawmidisoundcore 16384 1 sndmac_hid 16384 0sch_fq_codel 20480 2parport_pc 40960 1ppdev 24576 0lp 20480 0parport 53248 3 parport_pc,lp,ppdevip_tables 32768 0x_tables 40960 1 ip_tablesautofs4 45056 2uas 24576 0usb_storage 73728 2 uashid_generic 16384 0usbhid 53248 0hid 126976 2 usbhid,hid_genericradeon 1454080 11i2c_algo_bit 16384 1 radeonttm 102400 1 radeondrm_kms_helper 180224 1 radeonsyscopyarea 16384 1 drm_kms_helpersysfillrect 16384 1 drm_kms_helpersysimgblt 16384 1 drm_kms_helperpsmouse 151552 0fb_sys_fops 16384 1 drm_kms_helperdrm 491520 6 drm_kms_helper,radeon,ttmahci 40960 0pata_acpi 16384 0forcedeth 73728 0libahci 32768 1 ahcipata_amd 20480 1i2c_nforce2 20480 0video 49152 0floppy 81920 0wmi 32768 1 wmi_bmofroot@user-PC-Desktop:~# ls /lib/modules/$(uname -r)/kernel/drivers/net/wireless/realtek/rtl8821cu8821cu.koroot@user-PC-Desktop:~# sudo dkms statusbcmwl, 6.30.223.271+bdcom, 5.3.0-45-generic, x86_64: installedrtl8821CU, 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 allroot@user-PC-Desktop:~# iwconfig lo no wireless extensions.enp0s10 no wireless extensions.
Can someone help me to solve this problem???