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=0upon loading the wireless kernel module.
What finally worked was to disable 802.11n. Here is the procedure.
- Edit or create a new configuration file under
- Add the line below and save the file.
options iwlwifi 11n_disable=1
- Reload the
iwlwifimodule with the following command.
sudo rmmod iwldvm sudo rmmod iwlwifi sudo modprobe iwlwifi
- Connect to the Wi-Fi network.