Wi-Fi Card Not Detected

[mkntrds]

After scrubbing Windows 8.1 from a brand new Mini PC, I'm having trouble accessing Wi-Fi that worked under the Windows setup. I'm running Mint 20, 64-bit Cinnamon. From my searches, this forum and elsewhere, it appears that Mint 20 isn't recognizing the wi-fi hardware. I tried earlier versions of Mint as well: 19.3 and 18.3. Currently, I can only connect via wired. I seem to have the same issue as Mathilda here: viewtopic.php?p=1898307#p1898307

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System:    Kernel: 5.4.0-48-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 4.6.7 wm: muffin 4.6.3 
           dm: LightDM 1.30.0 Distro: Linux Mint 20 Ulyana base: Ubuntu 20.04 focal 
Machine:   Type: Desktop System: $(DEFAULT_STRING) product: $(DEFAULT_STRING) v: $(DEFAULT_STRING) serial: <filter> 
           Mobo: N/A model: T3 MRD v: $(DEFAULT_STRING) serial: <filter> UEFI: American Megatrends v: 5.11 date: 07/02/2020 
Battery:   ID-1: axp288_fuel_gauge charge: 89% condition: N/A volts: 4.5/N/A model: N/A type: Li-ion serial: N/A 
           status: Discharging 
           Device-1: hidpp_battery_0 model: Logitech Wireless Keyboard serial: <filter> charge: 55% (should be ignored) 
           rechargeable: yes status: Discharging 
CPU:       Topology: Quad Core model: Intel Atom x5-Z8350 bits: 64 type: MCP arch: Airmont rev: 4 L2 cache: 1024 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 11520 
           Speed: 480 MHz min/max: 480/1920 MHz Core speeds (MHz): 1: 480 2: 480 3: 574 4: 562 
Graphics:  Device-1: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics driver: i915 v: kernel 
           bus ID: 00:02.0 chip ID: 8086:22b0 
           Display: x11 server: X.Org 1.20.8 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1200~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics (CHV) v: 4.6 Mesa 20.0.8 compat-v: 3.0 direct render: Yes 
Audio:     Device-1: Intel HDMI/DP LPE Audio driver: HdmiLpeAudio message: bus/chip ids unavailable 
           Device-2: C-Media Audio Adapter (Unitek Y-247A) type: USB driver: hid-generic,snd-usb-audio,usbhid bus ID: 1-3:4 
           chip ID: 0d8c:0014 
           Sound Server: ALSA v: k5.4.0-48-generic 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 v: kernel port: e000 bus ID: 01:00.0 
           chip ID: 10ec:8168 
           IF: enp1s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Realtek 802.11ac NIC type: USB driver: btusb bus ID: 1-1:2 chip ID: 0bda:c820 serial: <filter> 
Drives:    Local Storage: total: 29.12 GiB used: 8.70 GiB (29.9%) 
           ID-1: /dev/mmcblk0 model: HBG4a2 size: 29.12 GiB serial: <filter> rev: 0x8 scheme: GPT 
Partition: ID-1: / size: 28.04 GiB used: 8.69 GiB (31.0%) fs: ext4 dev: /dev/mmcblk0p2 
Sensors:   System Temperatures: cpu: 59.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 200 Uptime: 41m Memory: 1.87 GiB used: 1.03 GiB (55.4%) Init: systemd v: 245 runlevel: 5 Compilers: 
           gcc: 9.3.0 alt: 9 Shell: bash v: 5.0.17 running in: gnome-terminal inxi: 3.0.38

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SecureBoot disabled
Platform is in Setup Mode

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0: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no

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enp1s0    no wireless extensions.
lo        no wireless extensions.

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Bus 002 Device 002: ID 05e3:0620 Genesys Logic, Inc. USB3.2 Hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0d8c:0014 C-Media Electronics, Inc. Audio Adapter (Unitek Y-247A)
Bus 001 Device 008: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 002: ID 0bda:c820 Realtek Semiconductor Corp. 802.11ac NIC
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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00:00.0 Host bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register (rev 36)
00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller (rev 36)
00:14.0 USB controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller (rev 36)
00:1a.0 Encryption controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine (rev 36)
00:1c.0 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #1 (rev 36)
00:1f.0 ISA bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU (rev 36)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)

Thank you

[Pjotr]

With (wired?) internet connection, launch Driver Manager. Does it offer you a driver? If so, install it and reboot.

[mkntrds]

The Driver Manager indicates that my computer does not need any additional drivers.

[Pjotr]

Try this:
https://easylinuxtipsproject.blogspot.c ... t.html#ID5
(item 5)

Use copy/paste to transfer the terminal commands.

[mkntrds]

Thank you,

I followed the procedure, but I don't see a change to my wifi. Is there a diagnostic that I can run to very I completed the #5 tip correctly?

[sleeper12]

Try this, one line at a time:

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sudo apt install build-essential -y
mkdir -p ~/build
cd ~/build
sudo apt install git
git clone https://github.com/brektrou/rtl8821CU.git
cd rtl8821CU
make
sudo make install 

Reboot

[morrownr]

Another option:

https://github.com/morrownr/8821cu

The installation instructions are included on the main page. This is a very recent driver that is performing very well here.

[HenryHunter]

After scrubbing Windows 8.1 from a brand new Mini PC, I'm having trouble accessing Wi-Fi that worked under the Windows setup. I'm running Mint 20, 64-bit Cinnamon. From my searches, this forum and elsewhere, it appears that Mint 20 isn't recognizing the wi-fi hardware router login. I tried earlier versions of Mint as well: 19.3 and 18.3. Currently, I can only connect via wired. I seem to have the same issue as Mathilda here: viewtopic.php?p=1898307#p1898307

Code: Select all

System:    Kernel: 5.4.0-48-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 Desktop: Cinnamon 4.6.7 wm: muffin 4.6.3 
           dm: LightDM 1.30.0 Distro: Linux Mint 20 Ulyana base: Ubuntu 20.04 focal 
Machine:   Type: Desktop System: $(DEFAULT_STRING) product: $(DEFAULT_STRING) v: $(DEFAULT_STRING) serial: <filter> 
           Mobo: N/A model: T3 MRD v: $(DEFAULT_STRING) serial: <filter> UEFI: American Megatrends v: 5.11 date: 07/02/2020 
Battery:   ID-1: axp288_fuel_gauge charge: 89% condition: N/A volts: 4.5/N/A model: N/A type: Li-ion serial: N/A 
           status: Discharging 
           Device-1: hidpp_battery_0 model: Logitech Wireless Keyboard serial: <filter> charge: 55% (should be ignored) 
           rechargeable: yes status: Discharging 
CPU:       Topology: Quad Core model: Intel Atom x5-Z8350 bits: 64 type: MCP arch: Airmont rev: 4 L2 cache: 1024 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 11520 
           Speed: 480 MHz min/max: 480/1920 MHz Core speeds (MHz): 1: 480 2: 480 3: 574 4: 562 
Graphics:  Device-1: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics driver: i915 v: kernel 
           bus ID: 00:02.0 chip ID: 8086:22b0 
           Display: x11 server: X.Org 1.20.8 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1200~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics (CHV) v: 4.6 Mesa 20.0.8 compat-v: 3.0 direct render: Yes 
Audio:     Device-1: Intel HDMI/DP LPE Audio driver: HdmiLpeAudio message: bus/chip ids unavailable 
           Device-2: C-Media Audio Adapter (Unitek Y-247A) type: USB driver: hid-generic,snd-usb-audio,usbhid bus ID: 1-3:4 
           chip ID: 0d8c:0014 
           Sound Server: ALSA v: k5.4.0-48-generic 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 v: kernel port: e000 bus ID: 01:00.0 
           chip ID: 10ec:8168 
           IF: enp1s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           Device-2: Realtek 802.11ac NIC type: USB driver: btusb bus ID: 1-1:2 chip ID: 0bda:c820 serial: <filter> 
Drives:    Local Storage: total: 29.12 GiB used: 8.70 GiB (29.9%) 
           ID-1: /dev/mmcblk0 model: HBG4a2 size: 29.12 GiB serial: <filter> rev: 0x8 scheme: GPT 
Partition: ID-1: / size: 28.04 GiB used: 8.69 GiB (31.0%) fs: ext4 dev: /dev/mmcblk0p2 
Sensors:   System Temperatures: cpu: 59.0 C mobo: N/A 
           Fan Speeds (RPM): N/A 
Info:      Processes: 200 Uptime: 41m Memory: 1.87 GiB used: 1.03 GiB (55.4%) Init: systemd v: 245 runlevel: 5 Compilers: 
           gcc: 9.3.0 alt: 9 Shell: bash v: 5.0.17 running in: gnome-terminal inxi: 3.0.38

Code: Select all

SecureBoot disabled
Platform is in Setup Mode

Code: Select all

0: hci0: Bluetooth
	Soft blocked: no
	Hard blocked: no

Code: Select all

enp1s0    no wireless extensions.
lo        no wireless extensions.

Code: Select all

Bus 002 Device 002: ID 05e3:0620 Genesys Logic, Inc. USB3.2 Hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 0d8c:0014 C-Media Electronics, Inc. Audio Adapter (Unitek Y-247A)
Bus 001 Device 008: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 001 Device 003: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 002: ID 0bda:c820 Realtek Semiconductor Corp. 802.11ac NIC
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Code: Select all

00:00.0 Host bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register (rev 36)
00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller (rev 36)
00:14.0 USB controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller (rev 36)
00:1a.0 Encryption controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine (rev 36)
00:1c.0 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #1 (rev 36)
00:1f.0 ISA bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU (rev 36)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)

Thank you

Hi,
The solution to your problem is here viewtopic.php?f=53&t=333256#p1910621

[FamCompKid]

Another option:

https://github.com/morrownr/8821cu

The installation instructions are included on the main page. This is a very recent driver that is performing very well here.

Hi,

From the main page, $ sudo ./dkms-install.sh returns:

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dkms appears to be installed.

Copying driver to: /usr/src/rtl8821cu-5.8.1.7

Copying 8821cu.conf to: /etc/modprobe.d

Creating symlink /var/lib/dkms/rtl8821cu/5.8.1.7/source ->
                 /usr/src/rtl8821cu-5.8.1.7

DKMS: add completed.
dkms add was successful.

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
'make' all KVER=5.4.0-52-generic -j3.......(bad exit status: 2)
Error! Bad return status for module build on kernel: 5.4.0-52-generic (x86_64)
Consult /var/lib/dkms/rtl8821cu/5.8.1.7/build/make.log for more information.
An error occurred while running: dkms build

I have no idea and I can't get my adapter to work. Thanks.