I have the same issue, here is an Ask Ubuntu with my wireless info as well, in case that helps in any way: http://askubuntu.com/questions/749420/wireless-lost-ability-to-use-5ghz-pce-ac68
I have the same issue, here is an Ask Ubuntu with my wireless info as well, in case that helps in any way: http:// askubuntu. com/questions/ 749420/ wireless- lost-ability- to-use- 5ghz-pce- ac68