[Ubuntu 21.04] Lenovo slim5 'no wifi adapter' 에러 수정

정말 길고 긴 싸움 끝에 이겨냈다.

 

소프트웨어 구성

$ inxi -b

System:    Host: ======-desktop Kernel: 5.13.0-21-generic x86_64 bits: 64 Desktop: GNOME 40.5 
           Distro: Ubuntu 21.10 (Impish Indri) 
Machine:   Type: Laptop System: LENOVO product: 82LN v: IdeaPad 5 15ALC05 
           serial: <superuser required> 
           Mobo: LENOVO model: ===== v: NO DPK serial: <superuser required> UEFI: LENOVO 
           v: H2CN22WW date: 09/30/2021 
Battery:   ID-1: BAT0 charge: 50.2 Wh (86.6%) condition: 58.0/57.0 Wh (101.7%) 
CPU:       Info: 8-Core AMD Ryzen 7 5700U with Radeon Graphics [MT MCP] speed: 1397 MHz 
           min/max: 1400/1800 MHz 
Graphics:  Device-1: AMD Lucienne driver: amdgpu v: kernel 
           Device-2: Syntek Integrated Camera type: USB driver: uvcvideo 
           Display: wayland server: X.Org 1.21.1.2 driver: loaded: amdgpu 
           note: n/a (using device driver) resolution: 1920x1080~60Hz 
           OpenGL: renderer: AMD RENOIR (DRM 3.41.0 5.13.0-21-generic LLVM 12.0.1) 
           v: 4.6 Mesa 21.2.2 
Network:   Device-1: Realtek RTL8852AE 802.11ax PCIe Wireless Network Adapter driver: N/A 
           Device-2: Realtek RTL8153 Gigabit Ethernet Adapter type: USB driver: r8152 
Drives:    Local Storage: total: 476.94 GiB used: 12.03 GiB (2.5%) 
Info:      Processes: 355 Uptime: 18m Memory: 13.52 GiB used: 2.9 GiB (21.4%) Shell: Bash 
           inxi: 3.3.06

대망의 해결방법

$ sudo apt-get update
$ sudo apt-get install make gcc linux-headers-$(uname -r) build-essential git

$ git clone https://github.com/lwfinger/rtw89.git -b v7
또는
$ git clone https://github.com/lwfinger/rtw89.git -b v6

$ mkdir ~/mok && cd ~/mok
$ openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -days 36500 -subj "/CN=Custom MOK/"
$ sudo mokutil --import MOK.der
$ reboot

# 블루스크린 > 'enroll mok' > (continue) > 'yes' > 비밀번호 입력 > 'reboot'

$ cd rtw89
$ make
$ /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 /home/<USERNAME>/mok/MOK.priv /home/<USERNAME>/mok/MOK.der rtw89core.ko
$ /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 /home/<USERNAME>/mok/MOK.priv /home/<USERNAME>/mok/MOK.der rtw89pci.ko
$ sudo make install
$ reboot

본인은 이걸로 해결함