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Thread: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

  1. #1
    Join Date
    May 2010
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    172

    after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    Hi,
    upon upgrading my ubuntu-20.04 to the latest stage the wifi stopped working (network manager does not even show the icon but ethernet works). Wifi of the older ubuntu-16.04 installed on the same PC works normally. I have scanned the net for hours and tried various of the described solutions but none worked for me. The hardware tool described here https://linux-hardware.org shows that the Intel driver 'Centrion Ultimate-N 6300' is missing. No idea why it disappeared! Can anybody please give me a point per point instruction of how to install this driver correctly!
    Thanks, a lot, D.

  2. #2
    Join Date
    May 2014
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    9,194
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    Try
    Code:
    sudo modprobe iwlwifi

  3. #3
    Join Date
    Aug 2005
    Location
    South Carolina, USA
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    25,443
    Distro
    Ubuntu 20.04 Focal Fossa

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    Jeremy and I would also like to see:

    Code:
    dmesg | grep iwl
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D., Sc.D.

  4. #4
    Join Date
    May 2010
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    172

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    Thank you!

    sudo modprobe iwlwifi:

    modprobe: ERROR: ../libkmod/libkmod-module.c:838 kmod_module_insert_module() could not find module by name='iwlwifi'
    modprobe: ERROR: could not insert 'iwlwifi': Unknown symbol in module, or unknown parameter (see dmesg)

    dmesg | grep iwl:
    no output

  5. #5
    Join Date
    May 2014
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    9,194
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    What results for
    Code:
    dpkg -l | grep linux-modules-extra-$(uname -r); dkms status; modinfo iwlwifi

  6. #6
    Join Date
    May 2010
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    172

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    I get:
    "modinfo: ERROR: Module iwlwifi not found."

  7. #7
    Join Date
    May 2014
    Location
    /home
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    9,194
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    Do
    Code:
    sudo apt install --reinstall linux-modules-extra-$(uname -r)
    Reboot

  8. #8
    Join Date
    May 2010
    Beans
    172

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    Hi, some more info:
    not being able to find this driver I did: sudo apt-get install backport-iwlwifi-dkms
    but "ls /usr/lib/firmware|grep wifi" shows me a lot of .ucode files but none containing "6300"
    Could it be that I have to fetch this file from somewhere else?

  9. #9
    Join Date
    May 2010
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    172

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    sudo apt install --reinstall linux-modules-extra-$(uname -r) gives me:
    .............................
    Unpacking linux-modules-extra-5.8.0-38-generic (5.8.0-38.43~20.04.1) ...
    Setting up linux-modules-extra-5.8.0-38-generic (5.8.0-38.43~20.04.1) ...
    Processing triggers for linux-image-5.8.0-38-generic (5.8.0-38.43~20.04.1) ...
    /etc/kernel/postinst.d/dkms:
    * dkms: running auto installation service for kernel 5.8.0-38-generic
    Error! Your kernel headers for kernel 5.8.0-38-generic cannot be found.
    Please install the linux-headers-5.8.0-38-generic package,
    or use the --kernelsourcedir option to tell DKMS where it's located
    Error! Your kernel headers for kernel 5.8.0-38-generic cannot be found.
    Please install the linux-headers-5.8.0-38-generic package,
    or use the --kernelsourcedir option to tell DKMS where it's located
    .................................................. ...........................................
    So I must have screwed up also the linux-headers. How do I reinstall them?

  10. #10
    Join Date
    May 2014
    Location
    /home
    Beans
    9,194
    Distro
    Ubuntu 18.04 Bionic Beaver

    Re: after upgrade of 20.04 wifi stops working (ultimate-N 6300)

    Do
    Code:
    sudo apt purge backport-iwlwifi-dkms
    sudo apt install --reinstall linux-headers-5.8.0-38-generic linux-modules-extra-5.8.0-38-generic
    Reboot if no errors
    Last edited by jeremy31; January 19th, 2021 at 12:52 AM.

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