wifi is gone after reboot

[tina]

tried, it did not help.

I used "" in the sudo iwconfig wlan0 key s:"MY_KEY". It did not help, now in the complain about key_name it shows it as "key_name".

Here is my interfaces now. Maybe something is wrong here?

auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
iface wlan0 inet dhcp

wireless-essid www
wireless-key KEY_NAME


iface wlan0 inet dhcp