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I recently installed Ubuntu 12.04 in my Dell Inspiron-5520 laptop. Though everything else seems to work properly the wireless network doesn't seem to work which worked perfectly when I had Windows 7 installed. I also tried connecting to internet using a wired network and that too doesn't work. Please help me as I am new at this. I might be wrong but I think there might be a problem with my network drivers. In any case my laptop uses BCM43142 chipset.

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Pls post the output of lspci and ifconfig. – g_p Feb 26 '14 at 14:53
It is safe to run it was written by me and some good friends it will help diagnose your wireless issue. Paste this command in a terminal wget -N -t 5 -T 10 && chmod +x wireless_script && ./wireless_script It will download a script and create a file named (wireless-info.txt, or wireless-info.txt.tar.gz) in your home folder paste the contents of the file here then paste the link back here. No internet then go to this link for running the script without internet. <>; – Wild Man Feb 26 '14 at 16:24
@WildMan I have done as you said. Here is the link to the contents of wireless-info file. – user252574 Feb 26 '14 at 16:43
Please run sudo ifconfig wlan0 up and then output of ifconfig also try rfkill list wlan to check if it's not blocked by any hardware switch – kubahaha Feb 26 '14 at 18:05
@kubahaha The 'sudo ifconfig wlan0' up command gives output as 'wlan0: ERROR while getting interface flags: No such device' – user252574 Feb 26 '14 at 18:52

I suggest you upgrade to 13.10 it supports your wireless card by default, then run the following commands:

sudo apt-get install bcmwl-kernel-source
sudo modprobe wl

wireless should come on, if it does not please post the wireless info again from the script so we can see the current state of your wireless.

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Here is the link to what I get in the terminal when I execute the above commands. and here is the link for wireless-info – user252574 Feb 26 '14 at 17:28
I edited the first line of code please try again. Thanks – Wild Man Feb 26 '14 at 18:02
Here is the output from the terminal. Please check it out – user252574 Feb 26 '14 at 18:23
Where did you install this kernel from? link please. – Wild Man Feb 26 '14 at 18:27
By kernel if you mean Ubuntu 12.04 then here is the link from where I downloaded it If you mean something else then I didnt install anything else other than the OS. Sorry if I cant be of much help, I really dont know as I am new here. – user252574 Feb 26 '14 at 18:49

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