Ubuntu14.04禁用客人登录以及远程远程登录

To remove guest login :

    sudo sh -c 'printf "[SeatDefaults]\nallow-guest=false\n" > /usr/share/lightdm/lightdm.conf.d/50-no-guest.conf'

    This will create a new file in /usr/share/lightdm/lightdm.conf.d

    To get back guest login again remove 50-no-guest.conf

To remove remote login :

    sudo sh -c 'printf "[SeatDefaults]\ngreeter-show-remote-login=false\n" >/usr/share/lightdm/lightdm.conf.d/50-no-remote-login.conf'

    This will create a new file in /usr/share/lightdm/lightdm.conf.d

    To get back remote login again remove 50-no-remote-login.conf