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I'm trying to follow the steps in this answer to make this USB wi-fi adaptor work on my Ubuntu 20.04 laptop, but get an error message.

This is how the device has been detected by the system:

$ lsusb | grep 802
Bus 001 Device 006: ID 0bda:c811 Realtek Semiconductor Corp. 802.11ac NIC

Other answers on here indicate that the above ID means I want the rtl8821CU driver. This apparently builds and installs fine:

$ git clone https://github.com/brektrou/rtl8821CU.git
$ cd rtl8821CU
$ sudo ./dkms-install.sh
About to run dkms install steps...

Creating symlink /var/lib/dkms/rtl8821CU/5.4.1/source ->
                 /usr/src/rtl8821CU-5.4.1


DKMS: add completed.


Kernel preparation unnecessary for this kernel.  Skipping...


Building module:
cleaning build area...
'make' KVER=5.4.0-66-generic.....................................................
cleaning build area...


DKMS: build completed.


8821cu.ko:
Running module version sanity check.


    

  • Original module
      

    • No original module exists within this kernel
      • 

    

    • 

  • Installation
      

    • Installing to /lib/modules/5.4.0-66-generic/updates/dkms/
      • 

    

    • 



depmod....


DKMS: install completed.
Finished running dkms install steps.

But then at the final step, it can't be found:

$ sudo modprobe 88212cu
modprobe: FATAL: Module 88212cu not found in directory /lib/modules/5.4.0-66-generic

What should I try next? Thank you.

Smylers
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1 Answers1

1

You should type commands a bit more carefully.

The module name is 8821cu.

Pilot6
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  • Really? Pffft. Several hours into trying to get this to work, and I failed with a stupid typo at the end. Bah. Thank you so much for spotting that so quickly — I will accept your answer as soon as Stack Exchange lets me. – Smylers Feb 27 '21 at 11:26