I’ve just upgraded from 11.04. During the upgrade, around the last stage I’ve got message that the upgrade process failed, returning exit code 1 and the system will try to rollback. At this stage, I already lost my mobile broadband internet connection (which is used to download the packages during upgrade process), though my modem is still recognized. I was guessing that this is what that made the upgrade failed to complete, but I’m not sure. So I rebooted, and nothing seems to be rolled back. I got 11.10 installed. First thing I checked was the internet connection. When I ticked ‘enable mobile broadband,’ my modem status changed to ‘preparing to connect’ for around 10 minutes then get back to ‘not connected.’ Why my broadband mobile internet can no longer connect after upgrade? Please help me solve this problem. Thanks.