I finally found a workaround based on limiting wifi to mode wifi G.
In a terminal : echo "options iwlwifi 11n_disable = 1" | sudo tee / etc / modprobe.d / iwlwifi.conf sudo modprobe -rfv iwlwifi sudo modprobe iwlwifi
Now, the wifi works, even if limited in speed.
I finally found a workaround based on limiting wifi to mode wifi G.
In a terminal :
echo "options iwlwifi 11n_disable = 1" | sudo tee / etc / modprobe.d / iwlwifi.conf
sudo modprobe -rfv iwlwifi
sudo modprobe iwlwifi
Now, the wifi works, even if limited in speed.