I installed Ubuntu 14.04 on my new Toshiba Satellite C75D a number of months ago, and everything worked great for months. Then suddenly, I didn't have wifi access anymore. I can connect by wire.
rfkill list says that my wireless LAN is both hard and soft blocked.
When I try to toggle the switch on the Network Manager to "on" for wifi, it won't let me.
My "hard switch" is the F12 key, but it doesn't seem to to anything.
Someone else had a similar question that didn't seem to get answered, except for the problem they had with suspend: 14.04 LTS on Toshiba Satellite C75D-B. Brightness, WiFi, Fn-keys control and Suspend problems.
lspci -knn | grep Net -A2:
05:00.0 Network controller : Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01) Subsystem: Lite-On Communications Inc Device [11ad:8631] Kernel driver in use: ath9k
It is not a dual boot system. I set it up to be Ubuntu only.