Recently I have installed Ubuntu 15.04 along side Windows 10. After booting into Ubuntu I was unable to see any wireless connections. See the below snapshot which will help you to understand the issue.
How To Install BCM43XX Wireless Drivers On Ubuntu
Wireless works fine in Windows without any issue.

To fix this issue I installed Broadcom BCM43XX Wireless Drivers On Ubuntu.

Steps of How To Install BCM43XX Wireless Drivers On Ubuntu 15.04 are as follows

Step 1: Finding information about device.
First we need to find out exact information about our hardware before installing the drivers.

Open a Terminal by pressing ctrl + alt + t
Enter following command

lspci -vvnn | grep -A 9 Network

The above command will show you the CHIP ID, PCI ID and Kernel drivers in use.
How To Install BCM43XX Wireless Drivers On Ubuntu

In my case the CHIP ID is BCM4312, PCI ID is 14e4:4315 and Kernel driver in use is wl.

Step 2: Installing BCM43XX Wireless Drivers
BCM4312 comes under Broadcom STA Wireless, so we need to install Broadcom STA Wireless drivers on our Ubuntu machine. For more information see this link

Obtain a temporary internet connection by ethernet, tethered or any other means.

Open a Terminal by pressing ctrl + alt + t and enter following command

sudo apt-get update
sudo apt-get --reinstall install bcmwl-kernel-source

Note: If you see the message “Module build for the currently running kernel was skipped since the kernel source for this kernel does not seem to be installed” then you are missing the appropriate generic linux-header package(s).

To test the driver (and remove the need for a computer restart) use:

sudo modprobe -r b43 ssb wl brcmfmac brcmsmac bcma
sudo modprobe wl

Allow several seconds for the network manager to scan for available networks before attempting a connection.
How To Install BCM43XX Wireless Drivers On Ubuntu

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How To Install BCM43XX Wireless Drivers On Ubuntu
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