Wireless configuration can be a problem. Check to see if Ubuntu has any proprietary driver suggestions for the wireless card. Also check with your wireless card manufacturer to see if they have a Linux driver. If not, you might have to use a Windows driver with an NDIS wrapper like
http://www.linuxant.com/driverloader/.
BTW, Ubuntu 10.10 did not recognize the wireless card in my laptop - I had to downgrade back to 10.04 which offered to install a proprietary driver.