Cannot connect to wireless network Ubuntu 12.04

Cannot connect to wireless network Ubuntu 12.04

Below is my wireless card information.
Command
sudo lshw -C network
Output :
*-network UNCLAIMED
description: Network controller
product: BCM4313 802.11b/g/n Wireless LAN Controller
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:03:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: latency=0
resources: memory:f0500000-f0503fff
Below is my kernel version.
Linux chinthaka-PC 3.5.0-37-generic #58~precise1-Ubuntu SMP Wed Jul 10
17:51:56 UTC 2013 i686 i686 i386 GNU/Linux
If I install the Broadcom driver using the additional drivers window I can
see the wireless networks and I cannot connect to them.
I have followed many threads in ubuntu forums to get this work and non of
them worked for me as of now. But when I execute below commands I can
connect to the wireless network. But when I restart my computer the
wireless is fully gone. I have to install the driver broadcom driver from
the scratch and execute the same commands again.
sudo modprobe -r wl
sudo apt-get install linux-firmware-nonfree
sudo apt-get remove --purge bcmwl-kernel-source
sudo modprobe b43
I have following entries in the /etc/modprobe.d/blacklist.conf file.
blacklist bcma
blacklist b43
blacklist b43legacy
blacklist bcma
blacklist ndiswrapper
blacklist brcm80211
Please help me to overcome this problem.