experimente desativar o gerenciador de rede e conectar-se a ele manualmente
systemctl stop network-manager.service
ifconfig wlan0 down
ifconfig wlan0 up
wpa_passphrahe "SSID" password > /etc/wpa.conf
wpa_supplicant -B -iwlan0 -c/etc/wpa.conf -Dwext && dhclient -r wlan0 && dhclient wlan0