Here describing the steps that taken by me to get the wireless connection right on my Ubuntu 10.04
After installing ubuntu 10.04, check the wireless network is enabled.
Open the terminal and type the following commands.
$ sudo su
# mii-tool -A 10baseT-FD eth0
Restart your system. It will work.
If not, activate broadcom STA wireless driver in your ubuntu by going to System > Administration > Hardware drivers . Select ‘Broadcom STA’ driver and click on the activate button. Restart your system. It will work. If your system has no such driver then install it by going to System > Administration > Synaptic Package Manager. Enter root password. Type ‘broadcom’ in Quick search. Right click on broadcom-sta-common and mark for install. Then click apply.
If your system is not showing any drivers in Hardware drivers, and showing ‘No proprietary drivers are use on this system.’ then uninstall the broadcom-sta driver and bcmwl-modalises and install it again. Restart the system. It will work.
Again if it’s not working download the package rt3090-dkms_126.96.36.199-0ubuntu0~ppa1_all from here. Now install the package by double-clicking the package. Restart the system. It will be Ok.