Ubuntu 14.04: can not connect to the new password-protected wifi network

After upgrading to Ubuntu 14.04 that can not be connected to any new WPA2 WiFi hotspots. . Existing work Here is a pastebin syslog output: http://pastebin.com/QVgmRmXp This is a mistake that is sometimes displayed in a popup window:

(nm-applet:28277): nm-applet-WARNING **: Connection activation failed: (1) Creating object for path '/org/freedesktop/NetworkManager/ActiveConnection/34' failed in libnm-glib.

There is a solution, but not quite. When not connected, a file will be created here: / etc / NetworkManager / system-connections / <name of network> If I can edit this file and add a password psk = password to [802-11-wireless-security] section then I can connect. more info: http://pastebin.com/sLrq2s6M

Follow these steps to switch to the new WiFi network

1. Click wi-fi symbol next to battery symbol.
2. Click Edit Connection is at the bottom of the drop-down list.
3. Select the network you want to connect and then click the edit button.
4. Click Wireless-Security tab and enter the network password, save and close.

Wireless drivers for ubuntu and linux are a bit picky when it comes to connecting to routers with certain adjustments, we will recommend the best settings to use. I recommend you change the type of encryption on the router to WPA2 with AES (CCMP) . Be sure not to select the WPA or WPA / WPA2 mixed mode, as it will again need TKIP is not recommended. Go to the network administrator and configure the wireless settings to match the screenshots to get the best results. we also:

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 restored when you reboot but if it helps you do, in many cases, 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

restart