ubuntu users using the ndiswrapper module with an MSI CB54G wifi card, you need to set RadioState on your /etc/ndiswrapper//*.conf equal to 0 as the default behavior of ndiswrapper -i ms68bm.inf is to set it to 1 which turns off the power this wifi card...

hmmnn... am not yet free from manually editing config files even on uber-user-friendly ubuntu... :(