Ubuntu 12.04, can't find my home wifi network

Question

I've tried several solutions I found on the web, but didn't manage to solve a problem.

Since today my laptop won't find my WiFi network, but neighbours' networks are suggested. Another laptop with U12.04 does find one.

What do I do?

I've Dell Latitude-E4310,

02:00.0 Network controller: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01)
    Subsystem: Dell Inspiron M5010 / XPS 8300
    Flags: bus master, fast devsel, latency 0, IRQ 17
    Memory at f2c00000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: brcmsmac
    Kernel modules: bcma, brcmsmac

also

NetworkManager Tool
State: connected (global)
- Device: eth1 -----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            wl
  State:             disconnected
  Default:           no
  HW Address:        1C:65:9D:7A:45:5C
  Capabilities:

  Wireless Properties
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

Should I provide anything else? Many thanks in advance.

UPD: http://pastebin.com/NfzBK2HQ

Solution

Please do:

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

if there are any errors please continue with the commands then reboot. your wireless should be working now.

Comments

[Wild Man]

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 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.txt, or wireless-info.txt.tar.gz) in your home folder paste the contents of the file here pastebin.com then paste the link back here. No internet then go to this link for running the script without internet. [url]ubuntuforums.org/showpost.php?p=12350385[/url]

[Anton]

@WildMan, done. pastebin.com/NfzBK2HQ

[Admin]

These answers are too complicated. If Ubuntu is trying to usurp the tyrants these answers must be something the masses can understand.

[Anton]

It seemed to me I've tried doing this. Well. I must have done too many modifications in sequence (not quite understanding what I was doing) :) This worked. Awesome. You saved me, thank you!

[Wild Man]

Make sure it works after a reboot, we may have to unblacklist a driver or two.

[Anton]

Everything works perfectly. So a wrong driver was a problem?

[Wild Man]

Yes it was the wrong driver.

[androidevil]

wow. thank you very much, man. this tip saved my life.

[Luís de Sousa]

This solution works as well on 14.04.

[LiTTle]

I cannot view my wireless adapter anymore!