I've recently reinstalled 12.04.
After the installation my mobile broadband modem can't keep the connection. It used to work with no problems at all. The network manager does see the modem, and I can use the Network manager for all settings.
First it says that the modem is recognized by the network, but direct after it disconnects and says that "modem network disconnected".
I have set the pin code for the USB-modem, restarted the netbook, without effect.I've even re-installed the network manager.
My modem is A ZTE MF680.
Can anyone help me?