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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 '

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  • Can you edit the post to include results for dmesg | grep 8812au
    – Jeremy31
    Oct 5, 2018 at 10:13
  • Thanks for correcting and formatting my comment! I typed the command on Ubuntu as you instruct. I don't know why Ubuntu replied this message because I didn't touch its kernel or driver at all after I confirmed the WIFI adapter was working... Oct 5, 2018 at 10:40
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    Reboot and use grub menu/advanced options to boot into 4.15.0-34 so we can get you a real fix
    – Jeremy31
    Oct 5, 2018 at 11:35
  • Thanks a lot. Because of your comment, I could find a solution. It was a thread on this site from the last year, and I found that you had helped him to solve the same issues as I got this time. It was quite surprise. You are so wonderful :) Oct 7, 2018 at 16:35

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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 :)

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    You could have up voted my answer on the other question and flagged this question as a duplicate
    – Jeremy31
    Oct 7, 2018 at 19:25
  • The page cannot let me vote yet. I still have less than 15 reputations. The page says that I am still too new to up vote your answer on the thread. But, I have set duplicate flag. Thanks for your instruction again :) Oct 7, 2018 at 22:41

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