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Thread: Cannot detect/connect to 5GHz band after dual boot

  1. #1
    Join Date
    Mar 2019
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    3

    Cannot detect/connect to 5GHz band after dual boot

    Hi,

    I'm very new to Ubuntu 18.04 (just dual-booted it on a Mac Pro 2015). Everything went smoothly, but now I'm not able to see my 5G band on the laptop. I can still see and use it when I boot into macOS. Also, the 2.4G band seems very unstable and keeps getting disconnected (the router is placed in another room, and it appears my connection is stable if I'm near it, but I never had this issue while on my macOS. It always gave me a stable connection even if I was in the other end of the house).

    I did just quick searches, and then did sudo iwlist scan. It showed 32 channels, half of them 2.4G and half of them 5G, but only my 2.4G band was there. I couldn't find my 5G band.

    iwlist channel gives the following:
    Code:
    wlp3s0    32 channels in total; available frequencies :
              Channel 01 : 2.412 GHz
              Channel 02 : 2.417 GHz
              Channel 03 : 2.422 GHz
              Channel 04 : 2.427 GHz
              Channel 05 : 2.432 GHz
              Channel 06 : 2.437 GHz
              Channel 07 : 2.442 GHz
              Channel 08 : 2.447 GHz
              Channel 09 : 2.452 GHz
              Channel 10 : 2.457 GHz
              Channel 11 : 2.462 GHz
              Channel 34 : 5.17 GHz
              Channel 36 : 5.18 GHz
              Channel 38 : 5.19 GHz
              Channel 40 : 5.2 GHz
              Channel 42 : 5.21 GHz
              Channel 44 : 5.22 GHz
              Channel 46 : 5.23 GHz
              Channel 48 : 5.24 GHz
              Channel 52 : 5.26 GHz
              Channel 56 : 5.28 GHz
              Channel 60 : 5.3 GHz
              Channel 64 : 5.32 GHz
              Channel 100 : 5.5 GHz
              Channel 104 : 5.52 GHz
              Channel 108 : 5.54 GHz
              Channel 112 : 5.56 GHz
              Channel 116 : 5.58 GHz
              Channel 132 : 5.66 GHz
              Channel 136 : 5.68 GHz
              Channel 140 : 5.7 GHz
              Channel 144 : 5.72 GHz
              Current Frequency:2.437 GHz (Channel 6)
    
    lo        no frequency information.
    None of the 5G channels are mine.
    Sorry if this is a silly question, but I have no clue what to do, and would appreciate any help!
    Last edited by DuckHook; March 4th, 2019 at 04:11 PM. Reason: Added [CODE] tags for clarity

  2. #2
    Join Date
    Mar 2007
    Location
    Promiseland
    Beans
    1,202
    Distro
    Xubuntu 20.04 Focal Fossa

    Re: Cannot detect/connect to 5GHz band after dual boot

    You need to be connected to the 5G channel for it to show as Current Frequency.
    This shows the 2.4G listing while connected to 2.4G source followed by the 5G listing while connected to 5G on same router
    Code:
    $ iwlist wlp4s0 chan
    wlp4s0    32 channels in total; available frequencies :
              Channel 01 : 2.412 GHz
              Channel 02 : 2.417 GHz
              Channel 03 : 2.422 GHz
              Channel 04 : 2.427 GHz
              Channel 05 : 2.432 GHz
              Channel 06 : 2.437 GHz
              Channel 07 : 2.442 GHz
              Channel 08 : 2.447 GHz
              Channel 09 : 2.452 GHz
              Channel 10 : 2.457 GHz
              Channel 11 : 2.462 GHz
              Channel 36 : 5.18 GHz
              Channel 40 : 5.2 GHz
              Channel 44 : 5.22 GHz
              Channel 48 : 5.24 GHz
              Channel 52 : 5.26 GHz
              Channel 56 : 5.28 GHz
              Channel 60 : 5.3 GHz
              Channel 64 : 5.32 GHz
              Channel 100 : 5.5 GHz
              Channel 104 : 5.52 GHz
              Channel 108 : 5.54 GHz
              Channel 112 : 5.56 GHz
              Channel 116 : 5.58 GHz
              Channel 120 : 5.6 GHz
              Channel 124 : 5.62 GHz
              Channel 128 : 5.64 GHz
              Channel 132 : 5.66 GHz
              Channel 136 : 5.68 GHz
              Channel 140 : 5.7 GHz
              Channel 144 : 5.72 GHz
              Channel 149 : 5.745 GHz
              Current Frequency:2.462 GHz (Channel 11)
    
    $ iwlist wlp4s0 chan
    wlp4s0    32 channels in total; available frequencies :
              Channel 01 : 2.412 GHz
              Channel 02 : 2.417 GHz
              Channel 03 : 2.422 GHz
              Channel 04 : 2.427 GHz
              Channel 05 : 2.432 GHz
              Channel 06 : 2.437 GHz
              Channel 07 : 2.442 GHz
              Channel 08 : 2.447 GHz
              Channel 09 : 2.452 GHz
              Channel 10 : 2.457 GHz
              Channel 11 : 2.462 GHz
              Channel 36 : 5.18 GHz
              Channel 40 : 5.2 GHz
              Channel 44 : 5.22 GHz
              Channel 48 : 5.24 GHz
              Channel 52 : 5.26 GHz
              Channel 56 : 5.28 GHz
              Channel 60 : 5.3 GHz
              Channel 64 : 5.32 GHz
              Channel 100 : 5.5 GHz
              Channel 104 : 5.52 GHz
              Channel 108 : 5.54 GHz
              Channel 112 : 5.56 GHz
              Channel 116 : 5.58 GHz
              Channel 120 : 5.6 GHz
              Channel 124 : 5.62 GHz
              Channel 128 : 5.64 GHz
              Channel 132 : 5.66 GHz
              Channel 136 : 5.68 GHz
              Channel 140 : 5.7 GHz
              Channel 144 : 5.72 GHz
              Channel 149 : 5.745 GHz
              Current Frequency:5.22 GHz (Channel 44)
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  3. #3
    Join Date
    Mar 2019
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    3

    Re: Cannot detect/connect to 5GHz band after dual boot

    Thanks for your reply,

    That's my problem though, I don't see the 5G channel at all when I go to 'Select Network'. I can see other 5G channels (neighbours'), but not mine. I can see and connect to our university's 5G channel though.

  4. #4
    Join Date
    May 2014
    Location
    /home
    Beans
    9,505
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: Cannot detect/connect to 5GHz band after dual boot

    Moved to networking
    I would check
    Code:
    iw reg list
    See if it matches your country code, there is a list at http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
    If you live in Iceland you would set the country code with
    Code:
    sudo iw reg set IS
    Replace IS with your country code

  5. #5
    Join Date
    Mar 2019
    Beans
    3

    Re: Cannot detect/connect to 5GHz band after dual boot

    It matched my country code, no issues with that.

    It seems that I can't connect only to my home network's 5G channel. I can connect to my friend's 5G network though. I'm thinking there's some issue with the router, but I'm not sure how to fix this.

    Thanks for your help!

  6. #6
    Join Date
    Mar 2007
    Location
    Promiseland
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    Xubuntu 20.04 Focal Fossa

    Re: Cannot detect/connect to 5GHz band after dual boot

    Recommend you refer to this permanent post, https://ubuntuforums.org/showthread.php?t=370108
    Do what is necessary to download and install the wireless info script, run it, and post the results.
    Cheers,


    The Linux Command Line at http://linuxcommand.org/

  7. #7
    Join Date
    May 2014
    Location
    /home
    Beans
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    Ubuntu 18.04 Bionic Beaver

    Re: Cannot detect/connect to 5GHz band after dual boot

    Is the 5GHz channel the router is on, match one from the list
    Code:
    iwlist chan

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