FIXthat solve the slow/intermittent Wi-Fi connection problem of the Realtek 8812BU Wireless LAN 802.11ac USB NICthat worked for meIf you have a Bluetooth REALTEKUSB Wireless LAN Driver and Utility 3.0 - Download. The latest version of REALTEK USB Wireless LAN Driver and Utility is 3.0, released on 02/18/2008. It was initially added to our database on 10/29/2007. REALTEK USB Wireless LAN Driver and Utility runs on the following operating systems: Windows. Users of REALTEK USB Wireless LAN Driver Realtek8811CU Wireless LAN 802.11ac USB NIC #4: Net : : 11/27/2019: Realtek 8812AE Wireless LAN 802.11ac PCI-E NIC: Net : 2023.70.0109.2018: 1/9/2018: Realtek 8812AE Wireless LAN 802.11ac PCI-E NIC #2 : Net Realtek8811CU Wireless LAN 802.11ac USB NIC. Post by yohanderson » Tue Aug 09, 2022 5:25 pm. para los que no se puedan conectar a internet por wifi conecten el cable usb de su android a la pc, en el tlf le activan el modo desarollador, luego se van paa herramientas o opciones del desarrolador, activan depuracion por usb, luego se van para punto de acceso Novídeo de hoje mostro como resolver problemas comuns no wi-fi, pra quem usa o driver Realtek 8812AU Wireless LAN 802.11ac USB NIC.Muitas vezes o wi-fi fica をrealtekRTL8811CUは高度に統合単一のチップをサポートする1ストリーム802.11acソリューションで無線lan (wlan) usb-マルチインタフェースコントローラ。それを組み合わせたwlan mac、を1t1rことが可能wlanベースバンド、とrfにシングルチップ。をRTL8811AU提供優れた KBVUY. 1 Black-Knight Members 56 posts OFFLINE GenderMale LocationSri Lanka Local time0906 AM Posted 22 November 2019 - 0857 AM I bought a realtek usb wifi adapter recieved a cd containing manual and drivers with the manual it shows the REALTEK USB Wireless LAN Utility version .when I installed the given driver in the cd, It didn't installed the utility tried few times again and searched the entire cd but there was no such utility programme. I searched the internet for that utility nothing anyone has it or newer version please upload and post me the link to download it. Thanks in advance! Back to top BC AdBot Login to Remove Register to remove ads 2 JohnC_21 JohnC_21 Members 33,034 posts OFFLINE GenderMale Local time1136 PM Posted 22 November 2019 - 0919 AM What OS? The Realtek Wifi Utility is not really necessary for a Wifi connection. Open Device Manager. Under the Network Category look for your Realtek Wifi. Select Properties. Under the Details tab select Hardware IDs in the dropdown box. Copy and Paste the first line into your next post. Back to top 3 Black-Knight Black-Knight Topic Starter Members 56 posts OFFLINE GenderMale LocationSri Lanka Local time0906 AM Posted 22 November 2019 - 1043 PM USB\Vid_0bda&Pid_c811&Rev_0200 I have drivers installed from the given I want the utility software to access the device's full features "Soft AP" function. Back to top 4 JohnC_21 JohnC_21 Members 33,034 posts OFFLINE GenderMale Local time1136 PM Posted 23 November 2019 - 0854 AM That ID goes to a Realtek 8811CU, Don't download from the drp site as it does not have the full software. Here is the Realtek link. I believe it has both the driver and utility software included as the size is 50MB but I can't confirm it. I could not find the Utility Software by itself. In any case I would create a System Restore Point before installing. Back to top 5 Black-Knight Black-Knight Topic Starter Members 56 posts OFFLINE GenderMale LocationSri Lanka Local time0906 AM Posted 23 November 2019 - 0917 AM Thanks JohnC for your It didn't had the utility. Back to top 6 JohnC_21 JohnC_21 Members 33,034 posts OFFLINE GenderMale Local time1136 PM Posted 23 November 2019 - 0941 AM Contact Realtek tech support. They may have a link to the software you need. Back to top 7 Black-Knight Black-Knight Topic Starter Members 56 posts OFFLINE GenderMale LocationSri Lanka Local time0906 AM Posted 23 November 2019 - 0955 AM Thanks for the tip!I think that may be the last option i have to a nice day! Back to top 8 JohnC_21 JohnC_21 Members 33,034 posts OFFLINE GenderMale Local time1136 PM Posted 23 November 2019 - 1006 AM I only found one reference to the utility for your chipset on google and the poster finally used something else. Back to top 9 Black-Knight Black-Knight Topic Starter Members 56 posts OFFLINE GenderMale LocationSri Lanka Local time0906 AM Posted 23 November 2019 - 1012 AM Thanks a lot for the sent an email to the realtek guys asking about the it failed I will give it a try. Back to top 10 Black-Knight Black-Knight Topic Starter Members 56 posts OFFLINE GenderMale LocationSri Lanka Local time0906 AM Posted 23 November 2019 - 1106 PM I finally found the downloaded the driver and the utility from below link. To direct download the file,follow below link.Windows version driver & utility Version of the REALTEK USB wireless utility is If you only want the utility,install the WlanUI from the above downloaded zip. Thanks JohnC and others who tried to help me! Have a nice day!! Back to top 11 JohnC_21 JohnC_21 Members 33,034 posts OFFLINE GenderMale Local time1136 PM Posted 24 November 2019 - 0928 AM Nice. Thanks for taking the time to post your solution. Back to top 12 ctait ctait Members 1 posts OFFLINE Local time1136 PM Posted 27 August 2020 - 0849 PM This is for Black-Knight Try " for the software you may be looking but the current version. Let me know if it works Edited by iMacg3, 27 August 2020 - 0947 PM. Moderator edit - removed email address from post Back to top 13 Ben_Shimon Ben_Shimon Members 1 posts OFFLINE Local time1136 AM Posted 07 December 2021 - 0220 AM From the CD I have that came with my 8811 dongle I zipped the file for the "REALTEK USB Wireless LAN Utility" and uploaded it to my Google Drive. You can download it and unzip it and then install it. I do not know if it is compatible with other models of wifi dongles made by Realtek or not. Back to top Realtek drivers for and USB-adapters. In the collection are two new items - ver date 2015/03/16+ Wireless Network Utility 2015/03/16 Warning!When using the system language other than English, the Wireless Network Utility can fall into a fix- use the English language interface OS X- or use the patched utility. I patched WNU To use, put the patched WirelessNetworkUtility in /Applications instead of the - ver date 2015/03/16.+ Wireless Network Utility 2015/03/27 Caution! The Wireless Network Utility works without problems on systems with languages other than patch is not required. 2. Old drivers for Realtek colections download for Mac OS X released official 4-in-1 Drivers for Realtek USB-adapters for OS X can take in a folder New_4in1_Dri installer contains the drivers ver_1003Warning!When using the system language other than English, the WirelessNetworkUtility can fall into a fix- use the English language interface OS X- or use the patched utility. To use, put the patched WirelessNetworkUtility in /Applications instead of the in patched WNU, I enabled "Advanced Settings" tab in UI... 3. Old drivers for Realtek chipsetRealtek RTL8811AU - Interface USB abgn+ac, MIMO 1x1, 433 Mbit/sRealtek RTL8812AU - Interface USB abgn+ac, MIMO 2x2, 867 Mbis/sThe colections download for Mac OS X of the latest versionRealtek released official Drivers for Realtek USB-adapters for OS X Yosemite. You can take in a folder installer contain version using the system language other than English, the WirelessNetworkUtility can fall into a fix- use the English language interface OS X- or use the patched utility. To use, put the patched WirelessNetworkUtility in /Applications instead of the in patched WNU, I enabled "Advanced Settings" tab in UI... 3LABS • Via Dante 16 - Milano MI 20121 CF/ 04146420965 - REA MI - 1729249 - Capitale Sociale euro Testata giornalistica associata all'USPI Unione Stampa Periodica Italiana, registrata presso il Tribunale di Milano, nr. 285 del 9/9/2013 Direttore Andrea Ferrario Copyright © 2022 - 3Labs Srl. - Tutti i diritti riservati Crissy Posts 4102 Joined Sat May 15, 2010 103 pm Realtek 8811Cu Wireless Lan Usb Nic I require a driver for the realtek 8811cu wireless lan usb nic. I hope some1 cane help me Detective Site Admin Posts 285712 Joined Sat Jan 31, 2009 319 pm Re Realtek 8811Cu Wireless Lan Usb Nic Post by Detective » Wed Aug 04, 2021 647 am Below you can download realtek 8811cu wireless lan usb nic driver for name realtek-881 size 35827 MBUpload source manufactuter websiteAntivirus software passed Norton 8811Cu Wireless Lan Usb Nicclick above to download Crissy Posts 4102 Joined Sat May 15, 2010 103 pm Re Re Realtek 8811Cu Wireless Lan Usb Nic Post by Crissy » Wed Aug 04, 2021 1111 pm Thx for sharing this driver ID 0bdab812 Realtek Semiconductor Corp. RTL88x2bu only, rtl8822BU chipset 0bdab812 0bdac820 rtl8821cu WiFi Bluetooth USB 0bdac820 Bus 001 Device 007 ID 0bdac820 Realtek Semiconductor Corp. NIC The device is supported by the following drivers lwfinger/rtl8723au_bt 不能用，NG brektrou/rtl8821CU 不能用，NG smp79/rtl8821CU 不能用，NG whitebatman2/rtl8821CU 不能用，NG 不能用，NG *** 备注： 能用的在本文的最下面 失败： [roothpi7 drivers] [roothpi7 drivers] git clone Cloning into 'rtl88x2bu'... remote Enumerating objects 1871, done. remote Counting objects 100% 138/138, done. remote Compressing objects 100% 94/94, done. remote Total 1871 delta 73, reused 96 delta 42, pack-reused 1733 Receiving objects 100% 1871/1871, MiB MiB/s, done. Resolving deltas 100% 1188/1188, done. [roothpi7 drivers] ls rtl8812au rtl88x2bu [roothpi7 drivers] cd rtl88 rtl8812au/ rtl88x2bu/ [roothpi7 drivers] cd rtl88x2bu/ [roothpi7 rtl88x2bu] ls clean core hal ifcfg-wlan0 include Kconfig LICENSE Makefile os_dep platform runwpa wlan0dhcp [roothpi7 rtl88x2bu] VER=$sed -n 's/\PACKAGE_VERSION="\.*\"/\1/p' [roothpi7 rtl88x2bu] rsync -rvhP ./ /usr/src/rtl88x2bu-${VER} sending incremental file list created directory /usr/src/ ./ .gitignore 422 100% 00000 xfr1, to-chk=704/706 Kconfig .git/objects/pack/ .git/objects/pack/pack-7aa47d04 100% 00000 xfr36, to-chk=651/706 ...... platform/ 100% 00000 xfr660, to-chk=2/706 platform/ 100% 00000 xfr661, to-chk=1/706 platform/ 989 100% 00000 xfr662, to-chk=0/706 sent bytes received bytes bytes/sec total size is speedup is [roothpi7 rtl88x2bu] [roothpi7 rtl88x2bu] dkms add -m rtl88x2bu -v ${VER} Creating symlink /var/lib/dkms/rtl88x2bu/ -> /usr/src/ DKMS add completed. [roothpi7 rtl88x2bu] [roothpi7 rtl88x2bu] dkms build -m rtl88x2bu -v ${VER} Kernel preparation unnecessary for this kernel. Skipping... Building module cleaning build area... make -j8 KERNELRELEASE= KVER= src=/usr/src/ exit status 2 Error! Bad return status for module build on kernel x86_64 Consult /var/lib/dkms/rtl88x2bu/ for more information. F*** ！ [roothpi7 rtl88x2bu] ls clean core hal ifcfg-wlan0 include Kconfig LICENSE Makefile os_dep platform runwpa wlan0dhcp [roothpi7 rtl88x2bu] chmod +x ./ [roothpi7 rtl88x2bu] ./ Kernel preparation unnecessary for this kernel. Skipping... Building module cleaning build area... make -j8 KERNELRELEASE= KVER= src=/usr/src/ exit status 2 Error! Bad return status for module build on kernel x86_64 Consult /var/lib/dkms/rtl88x2bu/ for more information. [roothpi7 rtl88x2bu] make all make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/ M=/root/drivers/rtl88x2bu modules make[1] Entering directory '/usr/src/kernels/ CC [M] /root/drivers/rtl88x2bu/core/ ^~~~~~~~ /root/drivers/rtl88x2bu/os_dep/linux/ note each undeclared identifier is reported only once for each function it appears in make[2] *** [scripts/ /root/drivers/rtl88x2bu/os_dep/linux/ Error 1 make[1] *** [Makefile1860 /root/drivers/rtl88x2bu] Error 2 make[1] Leaving directory '/usr/src/kernels/ make *** [Makefile2284 modules] Error 2 F*** ！ [roothpi7 rtl88x2bu] [roothpi7 rtl88x2bu] make uninstall rm -f /lib/modules/ /sbin/depmod -a NG NG NG NG NG RTL8812AU/21AU and RTL8814AU linux driver with monitor mode and frame injection The master branch is based on branch git clone [roothpi7 drivers] cd rtl8812au/ [roothpi7 rtl8812au] ls android core docs hal include Kconfig LICENSE Makefile os_dep platform tools [roothpi7 rtl8812au] [roothpi7 rtl8812au] make all make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/ M=/root/drivers/rtl8812au modules make[1] Entering directory '/usr/src/kernels/ CC [M] /root/drivers/rtl8812au/core/ CC [M] /root/drivers/rtl8812au/core/ ...... CC [M] /root/drivers/rtl8812au/core/ LD [M] /root/drivers/rtl8812au/ MODPOST /root/drivers/rtl8812au/ CC [M] /root/drivers/rtl8812au/ LD [M] /root/drivers/rtl8812au/ BTF [M] /root/drivers/rtl8812au/ Skipping BTF generation for /root/drivers/rtl8812au/ due to unavailability of vmlinux make[1] Leaving directory '/usr/src/kernels/ - Visit for support/reporting issues or check for newer versions branches of these drivers. - [roothpi7 rtl8812au] [roothpi7 rtl8812au] make install install -p -m 644 /lib/modules/ /sbin/depmod -a [roothpi7 rtl8812au] 看起来，成功一半， 还差签名 MOK（Machine Owner Key）[roothpi7 rtl8812au] modprobe 88XXau -v insmod /lib/modules/ modprobe ERROR could not insert '88XXau' Key was rejected by service 签了名， 还是不认网卡。 型号错了就是死局......[roothpi7 ~] [roothpi7 ~] lsusb Bus 002 Device 001 ID 1d6b0003 Linux Foundation root hub Bus 001 Device 005 ID 0bda0153 Realtek Semiconductor Corp. 3-in-1 SD/SDHC/SDXC Card Reader Bus 001 Device 009 ID 0bdac820 Realtek Semiconductor Corp. NIC [roothpi7 ~] [roothpi7 ~] usb_modeswitch -KW -v 0bda -p c820 Take all parameters from the command line * usb_modeswitch handle USB devices with multiple modes * Version C Josua Dietze 2017 * Based on libusb1/libusbx ! PLEASE REPORT NEW CONFIGURATIONS ! DefaultVendor= 0x0bda DefaultProduct= 0xc820 StandardEject=1 Look for default devices ... found USB ID 0bda0153 vendor ID matched found USB ID 0bdac820 vendor ID matched product ID matched Found devices in default mode 1 Access device 009 on bus 001 Get the current device configuration ... Current configuration number is 1 Use interface number 0 with class 224 Error can't use storage command in MessageContent with interface 0; interface class is 224, expected 8. Abort F*** [roothpi7 ~] usb_modeswitch -KW -v 0bda -p 0153 Take all parameters from the command line * usb_modeswitch handle USB devices with multiple modes * Version C Josua Dietze 2017 * Based on libusb1/libusbx ! PLEASE REPORT NEW CONFIGURATIONS ! DefaultVendor= 0x0bda DefaultProduct= 0x0153 StandardEject=1 Look for default devices ... found USB ID 0bda0153 vendor ID matched product ID matched found USB ID 0bdac820 vendor ID matched Found devices in default mode 1 Access device 005 on bus 001 Get the current device configuration ... Current configuration number is 1 Use interface number 0 with class 8 Use endpoints 0x01 out and 0x82 in USB description data for identification - Manufacturer Generic Product Serial No. 2012000 - Sending standard EJECT sequence Looking for active drivers ... OK, driver detached Set up interface 0 Use endpoint 0x01 for message sending ... Trying to send message 1 to endpoint 0x01 ... OK, message successfully sent Read the response to message 1 CSW ... Response successfully read 13 bytes, status 0 Trying to send message 2 to endpoint 0x01 ... OK, message successfully sent Read the response to message 2 CSW ... Response successfully read 13 bytes, status 0 Trying to send message 3 to endpoint 0x01 ... OK, message successfully sent Read the response to message 3 CSW ... Response successfully read 13 bytes, status 0 Trying to send message 4 to endpoint 0x01 ... OK, message successfully sent Read the response to message 4 CSW ... Response successfully read 13 bytes, status 0 Reset response endpoint 0x82 Reset message endpoint 0x01 -> Run lsusb to note any changes. Bye! ......似乎，还是，这个看起来靠点谱 rtw88-usb mac80211 kernel driver currently supported chipset's 8723du 8822bu with variants 8821cu 8822cu It's under GPL license, and please feel free to use it. Also welcome to upstream to the Linux kernel if you want, and please refer to the branch, for_kernel_upstream, which meets the Linux coding style, and may be easier to upstream. Thank to many people's kind help on this project. BIG tanks to Ji-Pin Jou and Neo Jou, for the USB parts supports at least managed client and monitor mode. This driver is based on Realtek's rtw88 in Linux main trunk. [roothpi7 drivers] git clone Cloning into 'rtw88-usb'... remote Enumerating objects 3149, done. remote Counting objects 100% 1177/1177, done. remote Compressing objects 100% 493/493, done. remote Total 3149 delta 967, reused 869 delta 684, pack-reused 1972 Receiving objects 100% 3149/3149, MiB MiB/s, done. Resolving deltas 100% 2412/2412, done. [roothpi7 drivers] [roothpi7 drivers] [roothpi7 drivers] cd rtw88-usb/ [roothpi7 rtw88-usb] ls Kconfig LICENSE fw log Makefile [roothpi7 rtw88-usb] [roothpi7 rtw88-usb] make clean rm -f *.o .*.d *.a *.ko .*.cmd *.mod* *.order *.symvers *.tmp_versions [roothpi7 rtw88-usb] [roothpi7 rtw88-usb] make all make -C /lib/modules/ M=/root/drivers/rtw88-usb make[1] Entering directory '/usr/src/kernels/ CC [M] /root/drivers/rtw88-usb/ CC [M] /root/drivers/rtw88-usb/ ...... BTF [M] /root/drivers/rtw88-usb/ Skipping BTF generation for /root/drivers/rtw88-usb/ due to unavailability of vmlinux CC [M] /root/drivers/rtw88-usb/ LD [M] /root/drivers/rtw88-usb/ BTF [M] /root/drivers/rtw88-usb/ Skipping BTF generation for /root/drivers/rtw88-usb/ due to unavailability of vmlinux CC [M] /root/drivers/rtw88-usb/ LD [M] /root/drivers/rtw88-usb/ BTF [M] /root/drivers/rtw88-usb/ Skipping BTF generation for /root/drivers/rtw88-usb/ due to unavailability of vmlinux make[1] Leaving directory '/usr/src/kernels/ [roothpi7 rtw88-usb] [roothpi7 rtw88-usb] make load echo "Unload upstream drivers" Unload upstream drivers for m in rtw88_8723de rtw88_8723d rtw88_8822be rtw88_8822b \ rtw88_8821ce rtw88_8821c rtw88_8822ce rtw88_8821c \ rtw88_pci rtw88_core; \ do rmmod "$m" 2> /dev/null; done; make *** [Makefile116 load] Error 1 [roothpi7 rtw88-usb] [roothpi7 rtw88-usb] make install WARNING ========================================== you are about to install rtw88-usb drivers Wait 5 sec or CTRL-C rtw88-usb drivers installed [roothpi7 rtw88-usb] [roothpi7 rtw88-usb] make firmware WARNING ========================================== you are about to install rtw88-usb firmware Wait 5 sec or CTRL-C rtw88-usb firmware installed [roothpi7 rtw88-usb] 好吧， 签名吧[roothpi7 signed-modules] ls /usr/src/kernels/$uname -r/scripts/sign-file /usr/src/kernels/ [roothpi7 signed-modules] vi sign-rtw88-usb [roothpi7 signed-modules] [roothpi7 signed-modules] cat ./sign-rtw88-usb !/bin/bash for modfile in $dirname $modinfo -n rtw88-usb/*.ko; do echo "Signing $modfile" /usr/src/kernels/$uname -r/scripts/sign-file sha256 \ /root/signed-modules/ \ /root/signed-modules/ "$modfile" done [roothpi7 signed-modules] [roothpi7 signed-modules] ls sign-rtw88-usb [roothpi7 signed-modules] chmod +x ./sign-rtw88-usb [roothpi7 signed-modules] ls sign-rtw88-usb [roothpi7 signed-modules] [roothpi7 signed-modules] ./sign-rtw88-usb Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ Signing /lib/modules/ [roothpi7 signed-modules] [roothpi7 signed-modules] modprobe rtw88-usb [roothpi7 signed-modules] [roothpi7 signed-modules] lsmod grep 88 rtw88_usb 20480 0 rtw88_core 163840 1 rtw88_usb mac80211 1134592 3 iwlmvm,rtw88_core,rtw88_usb cfg80211 1003520 4 iwlmvm,rtw88_core,iwlwifi,mac80211 还是认不了网卡，NG 还是认不了网卡，NG （废话）为避免每次内核更新时又要手工重新编译驱动模块，看看是否要使用动态内核模块支持（DKMS 的一个重要特征是，如安装新的内核版本，它会“自动”编译所有DKMS模块）。...... Realtek RTL8821CE Driver This repository hosts the code for the Arch Linux AUR Package. It's targeting Linux > and is being developed for Arch Linux and Ubuntu No support will be provided for other Linux distributions or Linux Kernel versions outside of that range. 同样不能用，NG RTL8811CU and RTL8821CU driver The Realtek RTL8811CU-CG is a highly integrated single-chip that supports 1-stream solutions with Multi-user MIMO Multiple-Input, Multiple-Output and Wireless LAN WLAN USB interface controller. It combines a WLAN MAC, a 1T1R capable WLAN baseband, and RF in a single chip. The RTL8811CU-CG provides an outstanding solution for a high-performance integrated wireless device. USB high speed interface GHz Support GHz Support Supports concurrent mode operates as two virtual WLAN interfaces MIMO config - 1x1 MU-MIMO AC wave2 256 QAM 过程略......每次总是感觉山穷水尽的时候， 就 *** 的看到曙光女神了。俺觉得答案总是藏在互联网的一个偏僻的角落， 等着被发现。事后发现， 这是唯一能用， 还是这个 好用仍旧重复上面的步骤， 从 GITHUB 克隆别人的文件。BUILD， 然后签名。[wenxuehpi7 ~]$ cd rtl8821cu581/ [wenxuehpi7 rtl8821cu581]$ ls [wenxuehpi7 rtl8821cu581]$ rm *.* -rf [wenxuehpi7 rtl8821cu581]$ ls [wenxuehpi7 rtl8821cu581]$ git clone Cloning into '8821cu'... remote Enumerating objects 1311, done. remote Counting objects 100% 187/187, done. remote Compressing objects 100% 132/132, done. remote Total 1311 delta 109, reused 119 delta 55, pack-reused 1124 Receiving objects 100% 1311/1311, MiB MiB/s, done. Resolving deltas 100% 663/663, done. [wenxuehpi7 rtl8821cu581]$ ls 8821cu [wenxuehpi7 rtl8821cu581]$ cd 8821cu/ [wenxuehpi7 8821cu]$ ls hal include Kconfig Makefile platform core LICENSE os_dep supported-device-IDs [wenxuehpi7 8821cu]$ sudo make all [sudo] password for wenxue make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/ M=/home/wenxue/rtl8821cu581/8821cu modules make[1] Entering directory '/usr/src/kernels/ CC [M] /home/wenxue/rtl8821cu581/8821cu/core/ CC [M] /home/wenxue/rtl8821cu581/8821cu/core/ ...... CC [M] /home/wenxue/rtl8821cu581/8821cu/hal/btc/ CC [M] /home/wenxue/rtl8821cu581/8821cu/hal/btc/ CC [M] /home/wenxue/rtl8821cu581/8821cu/platform/ CC [M] /home/wenxue/rtl8821cu581/8821cu/core/ LD [M] /home/wenxue/rtl8821cu581/8821cu/ MODPOST /home/wenxue/rtl8821cu581/8821cu/ CC [M] /home/wenxue/rtl8821cu581/8821cu/ LD [M] /home/wenxue/rtl8821cu581/8821cu/ BTF [M] /home/wenxue/rtl8821cu581/8821cu/ Skipping BTF generation for /home/wenxue/rtl8821cu581/8821cu/ due to unavailability of vmlinux make[1] Leaving directory '/usr/src/kernels/ [wenxuehpi7 8821cu]$ [wenxuehpi7 8821cu]$ [wenxuehpi7 8821cu]$ sudo make install install -p -m 644 /lib/modules/ /sbin/depmod -a [wenxuehpi7 8821cu]$ [wenxuehpi7 8821cu]$ modprobe 8821cu modprobe ERROR could not insert '8821cu' Operation not permitted 又 ***** 的忘记签名 [wenxuehpi7 8821cu]$ su - Password [roothpi7 ~] [roothpi7 ~] cd signed-modules/ [roothpi7 signed-modules] ls sign-rtl88-aircrk sign-rtw88-usb [roothpi7 signed-modules] [roothpi7 signed-modules] cp sign-rtw88-usb sign-8821cu [roothpi7 signed-modules] vi ./sign-8821cu [roothpi7 signed-modules] [roothpi7 signed-modules] cat ./sign-8821cu !/bin/bash for modfile in $dirname $modinfo -n 8821cu/*.ko; do echo "Signing $modfile" /usr/src/kernels/$uname -r/scripts/sign-file sha256 \ /root/signed-modules/ \ /root/signed-modules/ "$modfile" done [roothpi7 signed-modules] [roothpi7 signed-modules] ./sign-8821cu Signing /lib/modules/ Signing /lib/modules/ [roothpi7 signed-modules] [roothpi7 signed-modules] modprobe -a 8821cu [roothpi7 signed-modules] iwconfig lo no wireless extensions. enp2s0 no wireless extensions. wlp4s0 IEEE ESSID"Linksys0****" ModeManaged Frequency GHz Access Point 48F8****** Bit Rate= Mb/s Tx-Power=22 dBm Retry short limit7 RTS throff Fragment throff Encryption keyoff Power Managementon Link Quality=58/70 Signal level=-52 dBm Rx invalid nwid0 Rx invalid crypt0 Rx invalid frag0 Tx excessive retries0 Invalid misc150 Missed beacon0 virbr0 no wireless extensions. wlp0s20f0u3i2 unassociated Nickname"WIFIRTL8821CU" ModeManaged Frequency= GHz Access Point Not-Associated Sensitivity0/0 Retryoff RTS throff Fragment throff Encryption keyoff Power Managementoff Link Quality0 Signal level0 Noise level0 Rx invalid nwid0 Rx invalid crypt0 Rx invalid frag0 Tx excessive retries0 Invalid misc0 Missed beacon0 [roothpi7 signed-modules]确认已经安装了 sign-file[roothpi7 signed-modules] ls /usr/src/kernels/$uname -r/scripts/sign-file /usr/src/kernels/ for modfile in $dirname $modinfo -n 8821cu/*.ko; do echo "Signing $modfile" /usr/src/kernels/$uname -r/scripts/sign-file sha256 \ /root/signed-modules/ \ /root/signed-modules/ "$modfile" done参考阅读 Signing VirtualBox Kernel Modules Signing Kernel Modules for Secure Boot Dynamic Kernel Module Support Tool -Provided by Package -Used on-Purposeopenssl openssl Build system Generates public and private key pairsign-file kernel-devel Build system Perl script used to sign kernel modulesperl perl Build system Perl interpreter used to run the signing scriptmokutil mokutil Target system Optional tool used to manually enroll the public keykeyctl keyutils Target system Optional tool used to display public keys in the system key ring[roothpi7 ~] dkms status rtl88x2bu, added [roothpi7 ~] [roothpi7 ~] dkms status rtl88x2bu, added [roothpi7 ~] [roothpi7 ~] dkms remove rtl88x2bu/ -all Error! The module/version combo is not located in the DKMS tree. [roothpi7 ~] [roothpi7 ~] dkms remove rtl88x2bu/ -all - Deleting module version completely from the DKMS tree. - Done. 过程俺留着，解决问题的手段是类似或者说一样的。 方便寻找其他芯片 LINUX 驱动的读者去探索。 吐槽一句：REALTEK 把驱动藏着掖着， 也不知道为了什么。【磨难结束了】

realtek 8811cu wireless lan 802.11 ac usb