Centrino Ultimate N-6300 slow to connect to Wi-Fi network

Connection to a Wi-Fi network on my Ubuntu Linux laptop started failing intermittently after it was upgraded to 19.04. It would be established only after turning off and turning on the adapter many times.

Things that I tried but that did not work include:

  • disabling IPv6;
  • disabling power-saving on the Wi-Fi adapter;
  • disabling Bluetooth/Wi-Fi interference protection by setting the option bt_coex_active=0 upon loading the wireless kernel module.

What finally worked was to disable 802.11n. Here is the procedure.

  1. Edit or create a new configuration file under /etc/modprobe.d/ (e.g. iwlwifi_custom.conf).
  2. Add the line below and save the file.
    options iwlwifi 11n_disable=1
    
  3. Reload the iwlwifi module with the following command.
    sudo rmmod iwldvm 
    sudo rmmod iwlwifi
    sudo modprobe iwlwifi
    
  4. Connect to the Wi-Fi network.

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