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I have a Realtek 8812AU WIFI USB adapter,and till yesterday, it was working fine on Ubuntu 18.04. But, today, all the sudden, Ubuntu stopped recognizing the adapter. I am not familiar with Linux or hardware stuff... But, I am still writing the symptom as much as I can describe.

  1. When I installed a driver for it a month ago, I used a command, apt-get install rtl8812au-dkms, and it was recognized with no trouble.
  2. Today, Ubuntu suddenly stopped enabling the adapter. Wifi adapter list is empty on Setting menu. My Ubuntu is running on a dual boot machine. So, I restarted with Windows10, and the adapter has no issues working. So, I believe the adapter is fine physically.
  3. I typed the apt-get install rtl8812au-dkms command again. Ubuntu replied that the newest version is installed. So, the driver is still on Ubuntu.
  4. I researched online and found the lsusb command. By typing it, I found the adapter's company name was on a result from the command. So, at least, Ubuntu recognizes the adapter at the USB socket. I also switched it to another USB socket, and run the command. Then, it also showed the adapter on the different port.
  5. There is a small issue with the machine; the Ubuntu machine currently doesn't have any access to a wired LAN connection. So, if you know a solution, please teach me where I can download a driver or some other required files from to the other machine, and what commands I need to type after I copy those files to the Ubuntu machine physically...

  6. After I got a request from @Jeremy31 and @abu_bua (thanks for your quick reply!), I typed dmesg | grep 8812au and I received the following message from Ubuntu:

    [ 19.514781] 8812au: version magic '4.15.0-34-generic SMP mod_unload ' should be '4.15.0-36-generic SMP mod_unload '

buck_banzai
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1 Answers1

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After @Jeremy31 had given me an advice, I found this trouble was caused by the kernel update. So, I researched around. Then, I found the thread talking about the same issue last year. I was surprised that @Jeremy31 helped this person back then, too.

WiFi module 8812AU not working with kernel version >= 4.4.0-28-generic

Thanks a lot :)

buck_banzai
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