[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 can't 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 don't 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