Sorry, I think I was a bit to fast there.
Could you try installing these two packages:
usb-modeswitch libusb-dev
and then rebooting your computer, to see if that makes the modem work?
Cheers
Søren
** Package changed: usb-modeswitch (Ubuntu) => network-manager (Ubuntu)
** Changed in: network-manager (Ubuntu)
Status: Incomplete => New
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HP un2420 Mobile Broadband Module not found by gnome-networkmanager
https://bugs.launchpad.net/bugs/617859
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