libSM.so.6 missing

I’m getting the following error when trying to use things like cavupdater, and even cavdiagnostic

error while loading shared libraries: libSM.so.6: cannot open shared object file: No such file or directory

This is on a fresh install of ubuntu 12.04, running as a command line only server.

cmdscan seems to work OK.

Where can I get this missing library from?

Alternatively, how can I ensure that the latest virus definitions etc have been dowloaded without this?