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I installed Ubuntu 12.04 LTS on my laptop dell inspiron 1440. Wired connection works fine. But wireless connection does not work. I installed the driver. I can see my home wireless net work and configured with password. but after configuring it, it keep saying wireless network disconnected. I removed wired connection and internet does not work with wireless even though I see my network. This is what I did after going through previous questions.

lspci -nn to check what driver I need. The output is; Broacom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315 (rev 01)

As per recommendation I did this;

sudo apt-get install linux-headers-generic sudo apt-get install --reinstall bcmwl-kernel-source sudo modprobe wl

Assuming the wireless switch is on, your wireless should now be working; check:

rfkill list all

But I still get this message "wireless network disconnected" and wireless connection does not work. I ran software updates to make sure I am current before doing the above.

I spent lot of time on this. Any help is greatly appreciated.

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Your device also has another driver available that sometimes works better. Please get a temporary wired ethernet connection, open a terminal and do:

sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get update
sudo apt-get install firmware-b43-lpphy-installer

Detach the ethernet, reboot and let us know how it's working.

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I have the same wireless card and this is the procedure I go through on a new install to get my wireless working:

sudo apt-get install firmware-b43-lpphy-installer b43-fwcutter

then with your favorite text editor open up the file blacklist.conf in the /etc/modprobe.d/ directory and comment out 'blacklist bcm43xx' by putting a # in front of the text. Should look something like this:

# replaced by b43 and ssb.
#blacklist bcm43xx

You will probably need to restart your computer for the wireless to register. hope that helps!

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