I just installed kali linux on the dell inspiron 1545 and am unable to get a wireless connection

I attempted the following

root@kali:~# lspci -knn | grep Net -A2
0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
    Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]

# apt-get install firmware-iwlwifi
# modprobe -r iwlwifi; modprobe iwlwifi

I even tried commands I used when I installed Ubuntu on the same laptop

sudo apt-get install bcmwl-kernel-source
sudo modprobe -r b43 bcma
sudo modprobe wl

What should i do if something goes wrong?

UPDATE

I also ran

sudo apt-get install kali-linux-wireless

but I still cannot detect and connect to my home wi-fi.

Thank you

Tried first solution

I tried first solution, but when i go to administration > system, i get package manager. I searched for everything Broadcom downloaded, installed, rebooted, but still no wireless.

There has to be an easy solution ......

Am trying this, http://www.chokepoint.net/2014/04/installing-broadcom-bcm43142-drivers-on.html

I got errors while implementing the installation When i reboot there is no wireless detector

Update

I'm trying all your suggestions .... seems I will have to read the links you provided. Who would have imagined that getting wireless would be so hard? I'm going to extend the bounty time if possible

May be your wireless card is in turned off state, does the laptop have any dedicated physical switch or key combo(like fn+f3 on my acer laptop) to turn on/off wi-fi ? most laptops also have a LED to show Wi-Fi card state.

Device firmwares are not pre installed in kali-linux(my last used version 1.0.4 can't tell about latest versions) , so if not already installed, install them.

sudo apt-get install firmware-linux firmware-linux-free firmware-linux-nonfree

Install Broadcom wireless card firmware

sudo apt-get install firmware-brcm80211 firmware-b43-installer firmware-b43legacy-installer broadcom-sta-dkms

Then use proper kernel drivers, b43 or b43legacy, iwlwifi is Intel Wi-Fi card driver so firmware-iwlwifi is not necessary.