I upgraded ubuntu to 12.04 on my MSI U100 Plus netbook and found that the wifi icon is missing and I have no internet connection. However, if I plug in the ethernet cable and reboot, then the computer connects to wireless too (and the wifi icon appears), and this connection persists after I remove the ethernet cable.
Now, my question is: how explain to 12.04 that it should connect wireless without a trick with the cable?