I have tried several things but it doesn't work.

  • Please describe the problem with all observable symptoms? You have asked the proverbial dumb question. "My device doesn't work."
    – ruggb
    Apr 17 '17 at 20:52

It seems that the Broadcom BCM43142 has some problems with the Ubuntu 16.04 base kernel that elementary OS Loki uses. There are two solutions for this.

Option 1. Install the Kernel built specifically for your Wi-Fi Module

Run the following two commands in the terminal:

sudo apt update
sudo apt install bcmwl-kernel-source

Option 2. Blacklist the offending items manually.

Edit the blacklist file with this command:

sudo nano /etc/modprobe.d/blacklist.conf

Then append the following lines:

blacklist b43
blacklist bcma
blacklist ssb

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