Yesterday I installed Ubuntu 14.04 64-bit Daily Build and got this problem. There wasn't any problem in 13.10. I have a Dell Latitude D630 with Intel Wifi, Driver : iwl4965. I have tried the solution mentioned at http://www.webupd8.org/2013/01/fix-wireless-or-wired-network-not.html but its not working. Here is the output of sudo lshw -C network: *-network description: Wireless interface product: PRO/Wireless 4965 AG or AGN [Kedron] Network...
Originally asked by sixline on Stack Exchange (askubuntu) (CC BY-SA 4.0).