It is very easy to setup wireless networking in Ubuntu but you will need some information about your network to connect the PS3 to it.

SSID (Network Name):: you can get this from Network Status in the PS3 XMB menu, or if you click on your wireless network connection on a windows machine it will have the name there.

WEP/WPA Key:: this is just an encryption key it is normally found on the bottom of your router alternatively it can be found in your router control panel please look at you router manual for instructions on this.

Setting Up The Wireless Network

1. Click on the network icon in the top right next to the bluetooth icon.
2. Click ‘Create New Wireless Network’
3. Enter your network name sometimes called SSID you can find this in your network connection status while in the XMB on the PS3 or in your connection details windows on your PC.
4. Choose Security Type.
5. Enter Password/key
6. Click create

it should the connect to the network