I was using kali linux(dual boot with windows).. I couldnt connect to any wifi network.. After researching in many forums, I reinstalled kali linux. Even after that I couldnt connect to wifi. So i tried installing zorin os and ubuntu too. Still on both the OS i couldnt connect to wifi network.. Before installing kali linux i was able to coonect to wifi in Ubuntu..

Now im using kali.

Code:
root@kali:~# lspci -nnk | grep -i net -A2
05:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 05)
Subsystem: Dell Device [1028:0504]
Kernel driver in use: r8169
09:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter [14e4:4727] (rev 01)
Subsystem: Dell Device [1028:0012]
Kernel driver in use: bcma-pci-bridge
I also tried using an USB Wifi adaptor TP-LInk TL-WN721N too.
Still i cant connect in linux. But i can connect in windows.

Please help..