Disable guest session in Ubuntu 11.10 (oneiric ocelot)

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How to disable the guest account in Ubuntu 11.10?

Ubuntu 11.10 uses lightDM as the default display manager. Certainly it looks cooler than the old GDM, but by default it comes (in the ubuntu package) with a guest session enabled which is at least an arguable decision from many points of view (utility, security, etc). To disable that guest login account option edit the lightdm's config file /etc/lightdm/lightdm.conf and put on it the parameter allow-guest=false. After that the configuration file should look like:

~$ cat /etc/lightdm/lightdm.conf

[SeatDefaults]
greeter-session=unity-greeter
user-session=ubuntu
allow-guest=false

To achieve the changes restart the lightdm daemon:

sudo restart lightdm

That's it. You have a detailed description of all (many) the options that can be used in the configuration file lightdm.conf at /usr/share/doc/lightdm/lightdm.conf. Let me copy it here to make easier for you to consult them:

#
# General configuration
#
# start-default-seat = True to always start one seat if none are defined in the configuration
# greeter-user = User to run greeter as
# minimum-display-number = Minimum display number to use for X servers
# minimum-vt = First VT to run displays on
# user-authority-in-system-dir = True if session authority should be in the system location
# guest-account-script = Script to be run to setup guest account
# log-directory = Directory to log information to
# run-directory = Directory to put running state in
# cache-directory = Directory to cache to
# xsessions-directory = Directory to find X sessions
# xgreeters-directory = Directory to find X greeters
#
[LightDM]
#start-default-seat=true
#greeter-user=lightdm
#minimum-display-number=0
#minimum-vt=7
#user-authority-in-system-dir=false
#guest-account-script=guest-account
#log-directory=/var/log/lightdm
#run-directory=/var/run/lightdm
#cache-directory=/var/cache/lightdm
#xsessions-directory=/usr/share/xsessions
#xgreeters-directory=/usr/share/xgreeters

#
# Seat defaults
#
# xserver-command = X server command to run
# xserver-layout = Layout to pass to X server
# xserver-config = Config file to pass to X server
# xserver-allow-tcp = True if TCP/IP connections are allowed to this X server
# xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
# xdmcp-port = XDMCP UDP/IP port to communicate on
# xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf)
# greeter-session = Session to load for greeter
# greeter-hide-users = True to hide the user list
# user-session = Session to load for users
# allow-guest = True if guest login is allowed
# guest-session = Session to load for guests (overrides user-session)
# session-wrapper = Wrapper script to run session with
# display-setup-script = Script to run when starting a greeter session (runs as root)
# greeter-setup-script = Script to run when starting a greeter (runs as root)
# session-setup-script = Script to run when starting a user session (runs as root)
# session-cleanup-script = Script to run when quitting a user session (runs as root)
# autologin-guest = True to log in as guest by default
# autologin-user = User to log in with by default (overrides autologin-guest)
# autologin-user-timeout = Number of seconds to wait before loading default user
# autologin-session = Session to load for automatic login (overrides user-session)
# exit-on-failure = True if the daemon should exit if this seat fails
#
[SeatDefaults]
#xserver-command=X
#xserver-layout=
#xserver-config=
#xserver-allow-tcp=false
#xdmcp-manager=
#xdmcp-port=177
#xdmcp-key=
#greeter-session=example-gtk-gnome
#greeter-hide-users=false
#user-session=default
#allow-guest=true
#guest-session=UNIMPLEMENTED
#session-wrapper=lightdm-session
#display-setup-script=
#greeter-setup-script=
#session-setup-script=
#session-cleanup-script=
#autologin-guest=false
#autologin-user=
#autologin-user-timeout=0
#autologin-session=UNIMPLEMENTED
#exit-on-failure=false

#
# Seat configuration
#
# Each seat must start with "Seat:".
# Uses settings from [SeatDefaults], any of these can be overriden by setting them in this section.
#
#[Seat:0]

#
# XDMCP Server configuration
#
# enabled = True if XDMCP connections should be allowed
# port = UDP/IP port to listen for connections on
# key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use authentication (stored in keys.conf)
#
# The authentication key is a 56 bit DES key specified in hex as 0xnnnnnnnnnnnnnn.  Alternatively
# it can be a word and the first 7 characters are used as the key.
#
[XDMCPServer]
#enabled=false
#port=177
#key=

#
# VNC Server configuration
#
# enabled = True if VNC connections should be allowed
# port = TCP/IP port to listen for connections on
#
[VNCServer]
#enabled=false
#port=5900