I am trying to use a guest account in Ubuntu 10.10 however I am unable to stop the guest account from authenticating as a superuser and gaining root permissions dispite removing all permissions from the user-group control panel. The new guest account I created is not part of the admin group. However, with my new guest account I am unable to start a guest session from the panel, AND if I use the guest session from the panel I dont have the problem with the guest session being able to authenticate. How do I prevent super user authentication from an account in this situation? It seems that any account can authenticate and my /etc/sudoers file looks like this:
# This file MUST be edited with the 'visudo' command as root.
# See the man page for details on how to write a sudoers file.
# Host alias specification
# User alias specification
# Cmnd alias specification
# User privilege specification
root ALL=(ALL) ALL
# Allow members of group sudo to execute any command
# (Note that later entries override this, so you might need to move
# it further down)
%sudo ALL=(ALL) ALL
# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL