We've got mobile broadband from Proximus, but the software provided with it is for Windows and Mac only.
If I simply plug it in in an Ubuntu laptop, it brings up a wizard which helps you setting everything up. The mobile broadband provider is listed there. Only when I try to connect, it doesn't work. It just keeps trying to connect for a few minutes, but eventually fails.
I've tried entering the PIN and changing the DNS servers, but to no effect. What else can I try?