WiFi Adapter (RTL8811AU) Driver Installation Issue on Raspberry Pi 4 (Ubuntu

[cyberrobotic]

The output was

modprobe -c | grep -i c811
alias usb:v0403pC811d*dc*dsc*dp*ic*isc*ip*in* ftdi_sio

[jeremy31]

So what is happening when you try to compile the modules from the source code on github?

[cyberrobotic]

The driver get installed but can not recognize my wifi usb adapter

[jeremy31]

Try

sudo depmod -a

Then reboot

[cyberrobotic]

I will try it tomorrow thnx for help

[morrownr]

> ID 0bda:c811

That ID tells us that the chipset in your adapter is a rtl8821cu, not the rtl8821au.

You said the following driver did not work:

https://github.com/morrownr/8821au-20210708.git

The reason it did not work is between you did not read the README:

"Note: Please read the file "supported-device-IDs" for information about how to confirm that this is the correct driver for your adapter."

That statement is right up near the top of the README. Had you read it and followed the instructions, you would have known you were looking at the wrong driver.

The correct driver for your adapter is:

https://github.com/morrownr/8821cu-20210916