Ubuntu 14.04: Can't connect to new password protected wifi network

Follow these steps for changing to new WiFi network

1. Click on WiFi Symbol which is beside the battery symbol.
2. Click on Edit Connection which is at the bottom of the drop down.
3. Select the network on which you want to connect, and then click edit button.
4. Click on WiFi-security tab over there and enter the pass word of that network, save and close.

Now if you connect to this, everything will work fine.

Wireless drivers for ubuntu and linux are a little touchy when it comes to connecting to routers with certain settings, I am going to recommend the best settings to use.

I recommend that you change the encryption type in your router to WPA2 with AES (CCMP). Make sure not to select the WPA or WPA/WPA2 mixed mode, as that will again need TKIP which is discouraged.

Go into network manager and set your wireless settings to match the screenshots for best results.

Also do:

sudo ifconfig wlan0 down
sudo modprobe -rfv iwldvm
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi 11n_disable=1
sudo ifconfig wlan0 up

this will be reset when you reboot but if it helps which it does in many cases we can make it permanent by:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwldvm
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi

Reboot