this is really a weird problem,
it seems that mobile broadbands can be recognized only by the live/live-install version on the usb/cd but cannot be recognized on the installed system !
I tested it on 2 different computers "Laptops" (HP/ASUS) with 2 different usb broadbands (huawei/alcatel)
no broadband connection type is detected even with manually adding connections
no problems on the live version (iso --> USB) !
system : Ubuntu 11.10 X64amd just installed currently
* Laptop1: ASUS F8SN, cpu : intel core 2due 2.4ghz T8300 penryn SantaRosa USB:2.0 VGA:NVIDIA 9500m GS Motherboard : Asus F8000 , Intel chipset , Intel BUS
* laptop2: HP Pavilion DV 2550 Special Ed, CPU:1.5 core 2due, USB:2.0 Motherboard: Intel
- USB Mobile Broadband 1 : Huawei, Vid/Pid : 12D1 / 140C .. this one worked on both computers so far but not always, mostly it is not recognized
- USB Mobile Broadband 2: Alcatel, model : X060S .. this one never worked on both computers "except on live boot (usb/cd) both broadbands are always recognized" how strange is that !
it seems (from internet search) that this problem is common to all broadband users with no complete solution and it must be solved permanently