Disable guest login, Xubuntu 14.10

Terminal Emulator
1. sudo apt-get install gksu -y

2. gksu thunar

3. Browse to /usr/share/lightdm/lightdm.conf.d

4. Create an empty file called “99-no-guest.conf”

5. Open and place the following text in the file:

[SeatDefaults]
allow-guest=false

6. Save the file.

7. Execute the following command in terminal emulator and wait for the computer to restart. You shouldn’t be able to see the account anymore.

sudo shutdown -r now