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I'm using on Xubuntu 14.10 and I have exactly this model: 80J80021US

I've installed the bcmwl-kernel-source package, used this command sudo rfkill unblock all and also tried to disable ideapad_laptop by running sudo modprobe -r ideapad_laptop.

Nothing seems to work.

If I don't remove the ideapad_laptop I can see the device on the rfkill list:

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

When I use the command modprobe -r, then there's no wifi adapter at all:

2: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no

I found a post that said that I should add the wl module to /etc/modules. But then the following is in my log file:

[    5.069958] wl: module license 'MIXED/Proprietary' taints kernel.
[    5.072260] wl: module verification failed: signature and/or  required key missing - tainting kernel
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