OK that's weird. What kernel are you using?

Can you run this on the terminal (as normal user, no need to be root):

$ uname -a

and then

$ ls -l /lib/modules

and then

$ ls -l /lib/modules/`uname -r`

those above are ``back-ticks`` (or grave accent, or whatever you want to call them).

if you don't manage to run the last command, do this:

$ uname -r

you should see something like "3.2.0-32-generic" (more likely 2.6.28-bla-bla). Then

$ ls -l /lib/modules/2.6.28-bla_bla (i.e. what uname -r returned)

If you post the output of the above commands, we will know which kernel you are running and which modules are available. We can take it from there.