You can find the driver here. This is only for the 32bit version of Ubuntu. 64 bit users will need to go here. There is no deb for the 64bit driver so installation is a bit of a chore.
After installing the modem driver, you might get a pop-up window telling you that the Volume Control has quit unexpectedly and asks you to reload (or not reload) the panel. Click on Reload. Afterwards, the sound icon on the top right corner of the screen changes to "mute", but sound should be OK. A logout/login or GDM restart clears the issue. This issue happens because the modem driver lays down its own set of sound codecs and unloads the snd-hda-intel module during the installation process.
Step 1 - Install the Package
Step 2 - Reolad
Step 3 - Check the Restricted Driver Manager
System>Administration>Restricted Driver Manager
Thanks go to Alex Kriegisch for pointing this out.
edited by pHreaksYcle