Lenovo U550, Broadcom BCM4312 802.11b/g LP-PHY (rev 01), doesn't work [closed]

Question

I've tried several times to load the STA driver from Additional Driver. It seems that the driver is working, but I can not able the wireless from the network panel. I've also tried to fix the problem using some sudgestion from this forum, going to the terminal panel and follow the instruction. I've got the following lspci:

00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
01:00.0 Ethernet controller: Atheros Communications AR8131 Gigabit Ethernet (rev c0)
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

Thanks in advance for any sudgestion.

Answer 1

From the last of issue of Full Circle magazine, CC by-sa 3.0 licensed : (Quick How-To : Broadcom Wireless by Eric Scala)

When you install, or upgrade to, Ubuntu 11.04 you may notice that you can not use your Broadcom Wireless adapter. Many people have left Ubuntu and/or Linux for this reason. Yes, you can look online for a way to install the driver, but I'm going to show you how to quickly install the driver. The way I'm going to show you works in all Ubuntu derivatives.

First, open a terminal and enter:

sudo apt-get firmware-b43-installer

It will ask you for your password which you should enter. When the program has been successfully installed go back to your terminal and type in:

sudo apt-get install b43-fwcutter

Again, typing in your password. If you don’t wont to use the terminal you can open your package manager and search for bcm. Make sure you uninstall the bcmw1- kernal-source package. Search for firmware-b43-installer and install it, then search for b43-fwcutter and install that. Your wireless should now work. I used the steps above to also get the wireless on my Dell Inspiron 1200 laptop to work. Remember, you need to have a wired network connection to do the steps above!

Hope that helps.