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Thread: "No Wi-Fi Adapter found"?

  1. #1
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    "No Wi-Fi Adapter found"?

    Hi all,

    I've recently switched from Windows 10 to Ubuntu 20.04 LTS on my desktop, with very little prior experience.


    Anyways I can't seem to figure out how to connect to internet via any means whatsoever. The wifi icon isn't visible anywhere in the top bar, and the "Wi-Fi" tab in Settings just reads "No Wi-Fi Adapter Found". I've tried using a wired connection to install possibly-missing drivers for the aforementioned wifi adapter; but plugging in an ethernet cable freezes the whole system for some reason, and the only way to unfreeze is by pulling the plug and restarting.


    I don't think it's a hardware issue, as everything worked perfectly fine on Windows (both wired and wireless).


    here's the log output from wireless-info.txt:
    wireless-info.txt

    I've been at this nonstop for days, and at this point I think it's safe to say this is the single most frustrating and utterly infuriating problem I've ever had the turmoil of trying to solve. If anyone can possibly help me fix the issue, you will have my eternal gratitude.

    thanks
    Last edited by thatrius; June 23rd, 2021 at 03:17 AM. Reason: wrong attachment

  2. #2
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    Re: "No Wi-Fi Adapter found"?

    I think it's safe to say this is the single most frustrating and utterly infuriating problem I've ever had the turmoil of trying to solve.
    Don't be hard on yourself. Wireless is a black art that looks easy if you have a couple of decades of experience, luck and ingenuity. If not, it is, as you've seen, almost impossible.

    Please hook up the ethernet temporarily and open a terminal and do:

    Code:
    sudo apt update
    sudo apt install rtl8812au-dkms
    The process takes a few moments, so please be patient. When it's finished, detach the ethernet and reboot.

    Then post to tell us if your wireless is working as expected.

    --------------------------------------------------------------

    Note to searchers: The key is the usb.id here:

    Code:
    0bda:0811 Realtek Semiconductor Corp. 802.11ac WLAN Adapter
    Google "0bda:0811" and Ubuntu and you will find the answer. Be sure to pick the newest result that is solved.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D., Sc.D.

  3. #3
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    Re: "No Wi-Fi Adapter found"?

    Thanks for the reply!

    I was able to plug in the ethernet and paste the commands into the terminal before the screen froze; but they still both threw internet-failure errors.

    I guess the freezing issue is the one I should try and resolve first then, if an internet connection is mandatory. Any idea why plugging in an ethernet cable might cause a crash?

  4. #4
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    Re: "No Wi-Fi Adapter found"?

    Quote Originally Posted by thatrius View Post
    Thanks for the reply!

    I was able to plug in the ethernet and paste the commands into the terminal before the screen froze; but they still both threw internet-failure errors.

    I guess the freezing issue is the one I should try and resolve first then, if an internet connection is mandatory. Any idea why plugging in an ethernet cable might cause a crash?
    Let's see if the log tells us:

    Code:
    tail -f /var/log/syslog
    Plug in the ethernet cable and watch and carefully note the resulting output. Post it and we'll take a look.

    You might also check, after a reboot following a freeze:

    Code:
    less /var/log/dmesg.1.gz
    The last few lines might help us.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D., Sc.D.

  5. #5
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    Re: "No Wi-Fi Adapter found"?

    the first log didn't print anything before the crash, but here are the last few lines of the dmesg one:
    Code:
    kernel:  Generic FE-GE Realtek PHY r8169-500:00: attached PHY driver [Generic  FE-GE Realtek PHY] (mii_bus:phy_addr=r8169-500:00, irq=IGNORE)
    kernel: r8169 0000:05:00.0 enp5s0: Link is Down
    kernel: rfkill: input handler disabled

  6. #6
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    Re: "No Wi-Fi Adapter found"?

    Quote Originally Posted by thatrius View Post
    the first log didn't print anything before the crash, but here are the last few lines of the dmesg one:
    Code:
    kernel:  Generic FE-GE Realtek PHY r8169-500:00: attached PHY driver [Generic  FE-GE Realtek PHY] (mii_bus:phy_addr=r8169-500:00, irq=IGNORE)
    kernel: r8169 0000:05:00.0 enp5s0: Link is Down
    kernel: rfkill: input handler disabled
    Let's dig deeper:

    Code:
    sudo dmesg | grep -ie warn -ie error
    sudo dmesg | grep r8169 -e enp
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D., Sc.D.

  7. #7
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    Re: "No Wi-Fi Adapter found"?

    ran the commands:
    Code:
    sudo dmesg | grep -ie warn -ie error
    [    0.479692] pcieport 0000:00:1c.6: DPC: error containment capabilities: Int Msg #0, RPExt+ PoisonedTLP+ SwTrigger+ RP PIO Log 4, DL_ActiveErr+
    [    0.479922] pcieport 0000:00:1d.0: DPC: error containment capabilities: Int Msg #0, RPExt+ PoisonedTLP+ SwTrigger+ RP PIO Log 4, DL_ActiveErr+
    [    0.600659] RAS: Correctable Errors collector initialized.
    [    4.384197] EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro
    
    sudo dmesg | grep r8169 -e enp
    grep: r8169: No such file or directory

  8. #8
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    Re: "No Wi-Fi Adapter found"?

    sudo dmesg | grep r8169 -e enp
    grep: r8169: No such file or directory
    Sorry, I made a mistake. Please try again:

    Code:
    sudo dmesg | grep -e r8169 -e enp
    I see nothing alarming so far; let's keep looking.
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D., Sc.D.

  9. #9
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    Re: "No Wi-Fi Adapter found"?

    Okay got it,
    Code:
    sudo dmesg | grep -e r8169 -e enp
    [    0.831873] r8169 0000:05:00.0: can't disable ASPM; OS doesn't have ASPM control
    [    0.831882] r8169 0000:05:00.0: enabling device (0000 -> 0003)
    [    0.847794] libphy: r8169: probed
    [    0.847918] r8169 0000:05:00.0 eth0: RTL8168h/8111h, 4c:ed:fb:6b:f4:6c, XID 541, IRQ 126
    [    0.847919] r8169 0000:05:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
    [    0.848430] r8169 0000:05:00.0 enp5s0: renamed from eth0
    [    6.862561] Generic FE-GE Realtek PHY r8169-500:00: attached PHY driver [Generic FE-GE Realtek PHY] (mii_bus:phy_addr=r8169-500:00, irq=IGNORE)
    [    7.054682] r8169 0000:05:00.0 enp5s0: Link is Down

  10. #10
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    Re: "No Wi-Fi Adapter found"?

    Could it possibly be a driver issue? Not sure whether or not wired connections need drivers, but at least then I might be able to install one from a flash drive

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