Wifi in Linux (Ubuntu) on Speedport Router

The Ubuntu version 4.13 just docked the stick, system discovery and driver are carried out automatically and all existing networks were automatically detected = Plug-and-play.
To connect to the T-Onl. Router (Speedport) had the hardware encryption of the driver be turned off (from the computer to stick), it always came the error message "Network Disconnected" when login attempt (WPA2).
In a terminal session just the following three command-line type (or copy) and then insert the stick again, after that also works on the login WLAN (tip from the ubuntu forum):

echo "options ath9k_htc nohwcrypt = 1" | sudo tee /etc/modprobe.d/ath9k.conf
sudo modprobe -rfv ath9k_htc
sudo modprobe -v ath9k_htc