Refer to https://help.ubuntu.com/8.10/internet/C/wireless.html

Basically unclaimed means that the hardware is detected by the kernel, but the
driver is absent. You will likely need to install ndisgtk and use your Windows
driver. See the section on Windows wireless drivers. Re-boot after installing to
load the driver. You should then see wireless listed when you right click on the
network manager in the system tray.