SOLVED Ubuntu 11 04 wireless not working Intel Corporation Centrino Wireless N 1030 driver

I have installed Ubuntu 11.04 into my Dell Vostro 3350 with Intel Corporation Centrino Wireless-N 1030 wireless driver.
After finish install Ubuntu 11.04, I cant use wireless. What I did is upgrade the kernel.
This is the method I use to upgrade kernel.

1-Open terminal and type uname -r without to check what version of kernel you use.
2-Then type apt-cache search linux-image to search available kernel for your ubuntu version, in this case  
    11.04.

3-Choose the latest kernel which is linux-image-2.6.38-15-generic (in my case)
4-Install the kernel by using this command sudo apt-get install linux-image-x.x.xx-x-generic/pae,
   where x.x.xx-x=kernel and select generic version or generic-pae version. I dont know what is the
   different.
                         sudo apt-get install linux-image-2.6.38-15-generic
                 sudo apt-get install linux-headers-2.6.38-15-generic
You must install both image and headers

5-Then you will get 2 version of kernel at the grub menu. So use this command to remove old kernel
               
                         sudo apt-get autoremove linux-image-x.x.xx-x-generic/pae

6-If you got error for virtualbox, run this command
                       
                        sudo /etc/init.d/vboxdrv setup

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SOLVED Ubuntu 11 04 wireless not working broadcom driver

I have face this problem for a few times. This thing happen for broadcom b43xx wireless driver.
My colleague laptop also got a some problem after fresh install Ubuntu 11.04.
Here is solution for this problem.

Installing b43 drivers

8.04 (Hardy Heron), 9.10 (Karmic Koala), 10.04 (Lucid Lynx), 10.10 (Maverick Meerkat)

Note: On Ubuntu 11.04 installing the firmware-b43-installer package takes care of the downloading and installation of the b43 driver.

Supported models include:

BCM4301 BCM4306/2, BCM4306/3, BCM4311, BCM4312, BCM4318, BCM4320

The Ubuntu kernel in versions 8.04.x (Hardy Heron) and higher do provide the b43 drivers, however due to copyright restrictions not the proprietary firmware which is required to run your card.

Note: See here for a list of known PCI devices/IDs and their available modes as well as supported/unsupported chipsets.

The following instructions explain how to extract the required firmware.

b43 - No Internet access

If you do not have any other means of Internet access on your computer, you will have to install b43-fwcutter and patch packages from the install media. After that you will need to setup firmware manually (without the firmware automatically downloading and being set up).

Setp 1.

b43-fwcutter is located on the Ubuntu install media under ../pool/main/b/b43-fwcutter/ and patch is located under ../pool/main/p/patch/or both in the official repositories online.

Note: In some versions (10.04 and 11.04 at least) there is not a /pool/main/p/patch/ If this file is missing then you dont need it. In this case you only need to install /pool/main/b/b43-fwcutter by following the instructions below.

Double click on the package to install or in a terminal (under the desktop menu Applications > Accessories > Terminal) navigate to the folder containing the package and issue the following command:

:/b43-fwcutter/$ sudo dpkg -i b43-fwcutter*

In case you couldnt find the folder, wubi keeps it as a hidden folder so you have to mount it. Follow these steps:

~$ sudo mount -o loop /host/ubuntu/install/.fuse_hidden0000000400000001 /mnt
~$ cd /mnt/pool/main/b/b43-fwcutter/
~$ sudo apt-get install b43-fwcutter
~$ sudo dpkg -i b43-fwcutter*

As for the patch:

~$ cd /mnt/pool/main/p/patch/
~$ sudo apt-get install b43-fwcutter

Then unmount:

~$ sudo umount /mnt

Step 2.

On a computer with Internet access, download the required firmware files from http://downloads.openwrt.org/sources/wl_apsta-3.130.20.0.oand http://mirror2.openwrt.org/sources/broadcom-wl-4.150.10.5.tar.bz2

Step 3.

Copy the downloaded files to your home folder and execute the following commands consecutively in a terminal to extract and install the firmware:

~$ tar xfvj broadcom-wl-4.150.10.5.tar.bz2
~$ sudo b43-fwcutter -w /lib/firmware wl_apsta-3.130.20.0.o
~$ sudo b43-fwcutter --unsupported -w /lib/firmware broadcom-wl-4.150.10.5/driver/wl_apsta_mimo.o

Step 4.

Under the desktop menu System > Administration > Hardware/Additional Drivers, the b43 drivers can be activated for use.

Note: A computer restart may be required before using the wifi card.

LiveCD/LiveUSB

Note: The install media contents are mounted under /cdrom of the filesystem.

Step 5.

For temporary use with the LiveCD and LiveUSB environments, instead of a computer restart, in a terminal issue the following commands:

~$ sudo modprobe -r b43 ssb
~$ sudo modprobe b43

Note: Allow several seconds for the network manager to scan for available networks before attempting a connection.

Source : https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx#b43_-_No_Internet_access

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