Extremely slow connection with a Broadcom BCM4313 wireless card

Question

Recently upgraded into 14.04 from 12.04 using ubuntu update manager. After the system restart, the browser is not showing the web pages(although the wireless network is present/connected and running). I would say the internet is extremely extremely extremely slow, because few bookmarked sites showed some bits of site contents 1/1000 times. And the the loading circle symbol turns to orange most of the time, anyhow displays nothing.

wireless driver(proprietary) : Broadcom BCM4313 wireless driver lenovo G580 laptop intel i5

• I am not in a situation to connect my lap using the network cable. So looking forward to alternate solutions

• Here is the link to the current wireless status/information of my system.

• Here is the link to the NetHogs results and the browser loading window(which shows the page title and loading symbol turns orange). My internet connection peeks 580KB/s in windows and 12.04

Any help is much appreciated

UPDATE : Connected to the network using USB tethering from my phone, and works like a charm. Which means wired connection is still on. Done some 20KB of update and still the wifi stays the same. It feels so great(relieved) posting here from my 14.04. The pain is still there, but i will live.

The final Update

A special thanks to @Wild Man for solving this nightmare of mine. And to you guys who took the effort to give a helping hand. YOU GUYS ARE THE BEST

Solution

Please do:

sudo apt-get purge --remove bcmwl-kernel-source
sudo modprobe -rv wl
sudo modprobe -v brcmsmac

if there are any errors complete the rest of the commands anyway.

We may have to unblacklist some modules if the purge command does not do it for us.

Comments

[Wild Man]

Copy and paste this command in the terminal (ctrl+alt+t)wget -N -t 5 -T 10 http://dl.dropbox.com/u/57264241/wireless_script && chmod +x wireless_script && ./wireless_script It will download a script and create a file named wireless-info.tar.gz in your home folder with wireless information so we can see the condition of your wireless at this time and the Mac address, WPA key and WEP key are removed for your security,paste contents of the wireless-info.tar.gz file at pastebin.com. No internet <]ubuntuforums.org/showpost.php?p=12350385>

[theDistantStar]

Thanks for the replay @WildMan . Here is the link to the result pastebin.com/z5c4mQuQ

[Admin]

i have the same problem on lenovo u410. Wireless is detected but it never connects. pastebin.com/raw.php?i=4m8hfFqD Best regards, Adri

[theDistantStar]

@Sangeeth Khatri thanks for the answer. As there was no internet in the first place, downloaded the .deb file using windows and here are the results. I can guarantee that my internet connection peeks 580KB/s in windows and 12.04

[theDistantStar]

And you think i didn't try that!; and for the 1000th time of replugging it still the same :'(

[Sangeet Khatri]

Your internet is connected because if it wasn't connected then you would not be able to see the nethogs screen at the first place. So the bug actually is what you reported it as, that you are not getting bandwidth at the first place. I once had this problem but it was router related, more specifically MTU related, but since this bug has been caused after upgrading the OS, therefore router related bugs are out of the question. I would do my research and try to help if I got any relevant information but don't count on it.

[theDistantStar]

Yeah the router is shared with more than 10 people, and it works fine for them and for my windows partition. am desperately looking forward to that help

[theDistantStar]

You know what? i love you ma man. This is like some kind of God's hand, and definitely you are the God. You should be proud of yourself, making someone's life this happy deserves much appreciation. Heart felt thanks to you man; and i love this community. YOU GUYS ROCK

[BenR]

Don't follow these instructions if you have BCM4352 [14e4:43b1]. It removed the detection of the wifi device from Ubuntu.

[Wild Man]

The device that this answer pertains to is BCM4313 and not 14e4:43b1, so always make sure the commands you run pertains to your device.