unable to delete the guest account
I have updated from Ubuntu 11.04 to Ubuntu 11.10, also updating the surface from gnome to Unity ( I think it is called so).
Now I have an additional guest user at the login which is unnecessary and annoying.
I cannot delete it, although I have already deleted the relevant line in /etc/passwd and /etc/shadow, the login still comes up with that rubbish.
Can You explain how to get rid of that unnecessary and annoying security problem, and why it was introduced at all ?