This question already has an answer here:
I know this is not a new issue, and that there are countless threads out there(most notably this one) that aim to solve the exact problem I am having. I have followed many of them(including the one linked) to the tee, but unfortunately none of them have worked for me.
I am working on a Lenovo Y50-70. originally maybe a year ago I installed 14.04 on this machine and after a lot of hacking around I eventually got the wifi working, but a recent kernel update wrecked part of my system and I was forced to reinstall. Upon reinstalling I have not been able to get my wifi working after 4-5 days of scouring the forums for solutions. The OS doesn't even recognize that I have wifi.
As requested by Pilot, the output of
lspci -knn | grep Net -A2
08:00.0 Network controller : Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03) Subsystem: Lenovo Device [17aa:0623] 09:00.0 Ethernet controller : Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
The terminal output of
rfkill list all is
0: ideapad_wlan: Wireless LAN Soft blocked: no Hard blocked: no 1: ideapad_bluetooth: Bluetooth Soft blocked: no Hard blocked: no 2: hci0: Bluetooth Soft blocked: no Hard blocked: no
and the terminal output of
sudo modprobe wl is
modprobe: ERROR: could not insert 'wl': Required key not available