I have Ubuntu 11.04 installed on Dell Latitude D600. Also, have a dual boot with XP. My wired connection works fine, but wireless hasn't been working in Ubuntu. I tried many different solutions from the forums, but nothing worked so far. Latest, I installed the Windows Wireless Drivers interface and was able to download and activate a driver that works for me in XP. So in XP both, wired and wireless, connections work, while in Ubuntu only the wired connection works. With the windows driver I was able to get a Connection Established message, but I am still offline with the laptop. Tried WCID instead of Network Manager, but that didn't work either. Your help is greatly appreciated. Thanks!