غیر فعال کردن guest session (حل شد )

[rahim1234]

در اوبونتو 16.04

sudo mkdir /etc/lightdm/lightdm.conf.d

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

http://ubuntuhandbook.org/index.php/2016/04/remove-guest-session-ubuntu-16-04/